diff --git a/.circleci/config.yml b/.circleci/config.yml
index afe0690..00119b3 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -4,7 +4,7 @@ version: 2.1
 jobs:
   build:
     machine:
-      image: ubuntu-2004:202201-02
+      image: default
     steps:
       - checkout
       - run:
diff --git a/core/modules/args/hooks/init/init.source.sh b/core/modules/args/hooks/init/init.source.sh
index 354664b..65c574f 100755
--- a/core/modules/args/hooks/init/init.source.sh
+++ b/core/modules/args/hooks/init/init.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Gets the value of a script parameter, where --parameter=value.
 #
 # 1 will be returned if --parameter was passed without a value;
@@ -7,6 +9,7 @@
 # @param $1
 #   The name of parameter.
 function argvalue() {
+  # shellcheck disable=SC2154
   source "$GlobalSCRIPTDIR"/core/modules/args/scripts/arg-value.source.sh "$1"
   if [ -z "$ARGVALUE" ]; then
     echo 0
diff --git a/core/modules/args/scripts/arg-value.source.sh b/core/modules/args/scripts/arg-value.source.sh
index d37aba2..1725f28 100755
--- a/core/modules/args/scripts/arg-value.source.sh
+++ b/core/modules/args/scripts/arg-value.source.sh
@@ -1,8 +1,11 @@
+#!/bin/bash
+
 # Available arguments
 #  * $PARAMS, an array of params like 'a=b', 'c=d'
-
+# shellcheck disable=SC2154
 for i in "${GlobalPARAMS[@]}"
 do
+  # shellcheck disable=SC2154
   source "$GlobalSCRIPTDIR"/core/modules/args/scripts/parse-param.source.sh "$i"
   if [ "$NAME" == "$1" ]; then
     ARGVALUE="$VALUE"
diff --git a/core/modules/args/scripts/parse-arguments.source.sh b/core/modules/args/scripts/parse-arguments.source.sh
index 3057fbc..c79a017 100755
--- a/core/modules/args/scripts/parse-arguments.source.sh
+++ b/core/modules/args/scripts/parse-arguments.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 set -e
 
 # start by cycling through all arguments provided by the user.
@@ -11,7 +13,8 @@ while [ $# -gt 0 ]; do
       UNVALIDATEDCOMMAND=$1
       debug "Command is $COMMAND"
     else
-      GlobalARGS+=($1)
+      
+      GlobalARGS+=("$1")
       debug "$1 is an arg"
     fi
   fi
@@ -21,5 +24,5 @@ done
 if [ -z "$UNVALIDATEDCOMMAND" ]; then
   UNVALIDATEDCOMMAND=help
 fi
-
+# shellcheck disable=SC2154
 source "$GlobalSCRIPTDIR"/core/modules/args/scripts/validate-command.source.sh
diff --git a/core/modules/args/scripts/parse-param.source.sh b/core/modules/args/scripts/parse-param.source.sh
index ba950cc..31dfa19 100755
--- a/core/modules/args/scripts/parse-param.source.sh
+++ b/core/modules/args/scripts/parse-param.source.sh
@@ -1,8 +1,12 @@
+#!/bin/bash
+
 ARG="$1"
-NAME=$(sed 's/=.*$//g' <<< "$ARG")
-NAME=$(sed 's/--//g' <<< "$NAME")
-VALUE=$(sed 's/^--.*=//g' <<< "$ARG")
+NAME="${ARG%%=*}"     # Remove everything after the first '='
+NAME="${NAME//--/}"    # Remove '--' from the name
+VALUE="${ARG#*=}"      # Extract the value after '='
 
+# If VALUE is empty, set it to 1
 if [ -z "$VALUE" ]; then
   VALUE=1
 fi
+
diff --git a/core/modules/args/scripts/run-command.source.sh b/core/modules/args/scripts/run-command.source.sh
index 73b7918..71963c7 100755
--- a/core/modules/args/scripts/run-command.source.sh
+++ b/core/modules/args/scripts/run-command.source.sh
@@ -1,10 +1,13 @@
-# At this point $GlobalCOMMAND is valid so we can run it.
+#!/bin/bash
 
+# At this point $GlobalCOMMAND is valid so we can run it.
+# shellcheck disable=SC2154
 invoke-all "pre-command-$GlobalCOMMAND"
-
+# shellcheck disable=SC2154
 if [ "$(ls "$GlobalSCRIPTDIR"/core/modules/*/commands/"$GlobalCOMMAND"/"$GlobalCOMMAND".source.sh 2>/dev/null)" ]; then
   for f in "$GlobalSCRIPTDIR"/core/modules/*/commands/"$GlobalCOMMAND"/"$GlobalCOMMAND".source.sh
     do
+      # shellcheck disable=SC1090
       source "$f"
   done
 fi
@@ -12,6 +15,7 @@ fi
 if [ "$(ls "$GlobalSCRIPTDIR"/script/modules/*/commands/"$GlobalCOMMAND"/"$GlobalCOMMAND".source.sh 2>/dev/null)" ]; then
   for f in "$GlobalSCRIPTDIR"/script/modules/*/commands/"$GlobalCOMMAND"/"$GlobalCOMMAND".source.sh
     do
+      # shellcheck disable=SC1090
       source "$f"
   done
 fi
diff --git a/core/modules/args/scripts/validate-command.source.sh b/core/modules/args/scripts/validate-command.source.sh
index 37579ee..80b6708 100755
--- a/core/modules/args/scripts/validate-command.source.sh
+++ b/core/modules/args/scripts/validate-command.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+# shellcheck disable=SC2154
 ls "$GlobalSCRIPTDIR"/core/modules/*/commands/"$UNVALIDATEDCOMMAND"/"$UNVALIDATEDCOMMAND".source.sh 2>/dev/null >/dev/null || ls "$GlobalSCRIPTDIR"/script/modules/*/commands/"$UNVALIDATEDCOMMAND"/"$UNVALIDATEDCOMMAND".source.sh 2>/dev/null >/dev/null || { echo -e "$GlobalSCRIPTNAME: Invalid command $UNVALIDATEDCOMMAND"; echo -e "See '$GlobalSCRIPTNAME usage' for available commands."; exit 1; }
 
 GlobalCOMMAND="$UNVALIDATEDCOMMAND"
diff --git a/core/modules/core/hooks/init/init.source.sh b/core/modules/core/hooks/init/init.source.sh
index a1ffb9b..540f155 100755
--- a/core/modules/core/hooks/init/init.source.sh
+++ b/core/modules/core/hooks/init/init.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 function uuid() {
   if [ -f /proc/sys/kernel/random/uuid ]; then
     LocalTEMPID=$(cat /proc/sys/kernel/random/uuid)
diff --git a/core/modules/core/scripts/glob-exists.sh b/core/modules/core/scripts/glob-exists.sh
index 2221b8c..690829b 100755
--- a/core/modules/core/scripts/glob-exists.sh
+++ b/core/modules/core/scripts/glob-exists.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # See https://github.com/koalaman/shellcheck/wiki/SC2144
 set -e
 
diff --git a/core/modules/core/scripts/uuid.sh b/core/modules/core/scripts/uuid.sh
index 3300c72..fdaa45a 100755
--- a/core/modules/core/scripts/uuid.sh
+++ b/core/modules/core/scripts/uuid.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Returns a unique string
 
 if [ -f /proc/sys/kernel/random/uuid ]
diff --git a/core/modules/development/commands/self-test-list/self-test-list.source.sh b/core/modules/development/commands/self-test-list/self-test-list.source.sh
index c857b2f..f9ef8ea 100755
--- a/core/modules/development/commands/self-test-list/self-test-list.source.sh
+++ b/core/modules/development/commands/self-test-list/self-test-list.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 for f in $(development_get_all_tests); do
   output list-element:"$f" 'info' "$f"
 done
diff --git a/core/modules/development/commands/self-test/self-test.source.sh b/core/modules/development/commands/self-test/self-test.source.sh
index 6daa593..0eb711b 100755
--- a/core/modules/development/commands/self-test/self-test.source.sh
+++ b/core/modules/development/commands/self-test/self-test.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ALLTESTS=$(development_get_all_tests)
 
 for f in $ALLTESTS; do
@@ -20,6 +22,7 @@ set -e
 SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd -P)"
 
 echo -e "[info] removing $SCRIPTDIR/tmp/test-data directory"
+# shellcheck disable=SC2154
 rm -rf "$GlobalSCRIPTDIR"/tmp/test-*
 echo -e '[info] linting'
 DOCKER=docker
diff --git a/core/modules/development/hooks/end/end.source.sh b/core/modules/development/hooks/end/end.source.sh
index 4e1ff6c..6612ebc 100755
--- a/core/modules/development/hooks/end/end.source.sh
+++ b/core/modules/development/hooks/end/end.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [ "$(argvalue debug)" == '1' ]; then
   echo -e "-----"
   echo -e "Printing full log because you set the --debug flag."
diff --git a/core/modules/development/hooks/init/init.source.sh b/core/modules/development/hooks/init/init.source.sh
index 2c7c534..5e4dd2c 100755
--- a/core/modules/development/hooks/init/init.source.sh
+++ b/core/modules/development/hooks/init/init.source.sh
@@ -1,4 +1,7 @@
+#!/bin/bash
+
 function debug() {
+  # shellcheck disable=SC2154
   source "$GlobalSCRIPTDIR"/core/modules/development/scripts/debug.source.sh "$1"
 }
 
diff --git a/core/modules/development/scripts/debug.source.sh b/core/modules/development/scripts/debug.source.sh
index 6db9ca4..6de18f1 100755
--- a/core/modules/development/scripts/debug.source.sh
+++ b/core/modules/development/scripts/debug.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 LOG+=("[$2] $1")
diff --git a/core/modules/development/scripts/lint.source.sh b/core/modules/development/scripts/lint.source.sh
index 956f25d..6a77a8c 100644
--- a/core/modules/development/scripts/lint.source.sh
+++ b/core/modules/development/scripts/lint.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 echo '[info] About to get ShellCheck metrics'
 echo '[info] if you are getting a false negative put:'
 echo '[info] => # shellcheck disable=SC2016'
@@ -8,4 +10,4 @@ echo '[info] => # shellcheck disable=SC2016'
 
 # shellcheck disable=SC2086
 find . -name "*.sh" -print0 | \
-  xargs -0 $DOCKER run --rm -v "$(pwd)":/code dcycle/shell-lint --exclude=SC2034
+  xargs -0 $DOCKER run --rm -v "$(pwd)":/code dcycle/shell-lint:2 --exclude=SC2034
diff --git a/core/modules/extensibility/hooks/init/init.source.sh b/core/modules/extensibility/hooks/init/init.source.sh
index d01694f..844f9a0 100755
--- a/core/modules/extensibility/hooks/init/init.source.sh
+++ b/core/modules/extensibility/hooks/init/init.source.sh
@@ -1,3 +1,6 @@
+#!/bin/bash
+
 function invoke-all () {
+  # shellcheck disable=SC2154
   source "$GlobalSCRIPTDIR/core/modules/extensibility/scripts/invoke-all.source.sh" "$1"
 }
diff --git a/core/modules/extensibility/scripts/invoke-all.source.sh b/core/modules/extensibility/scripts/invoke-all.source.sh
index e0f2a86..034ea7c 100755
--- a/core/modules/extensibility/scripts/invoke-all.source.sh
+++ b/core/modules/extensibility/scripts/invoke-all.source.sh
@@ -1,10 +1,14 @@
+#!/bin/bash
+
 # Let modules respond to specific events like init, end, etc.
+# shellcheck disable=SC2154
 if ls "$GlobalSCRIPTDIR"/core/modules/*/hooks/"$1"/"$1".source.sh 1> /dev/null 2>&1; then
   for f in "$GlobalSCRIPTDIR"/core/modules/*/hooks/"$1"/"$1".source.sh
     do
       # Cannot call debug() here because invoke-all might be used before
       # functions are available.
       source "$GlobalSCRIPTDIR"/core/modules/development/scripts/debug.source.sh "About to call '$f'." 'full'
+      # shellcheck disable=SC1090
       source "$f"
   done
 else
@@ -17,6 +21,7 @@ if ls "$GlobalSCRIPTDIR"/script/modules/*/hooks/"$1"/"$1".source.sh 1> /dev/null
       # Cannot call debug() here because invoke-all might be used before
       # functions are available.
       source "$GlobalSCRIPTDIR"/core/modules/development/scripts/debug.source.sh "About to call '$f'." 'full'
+      # shellcheck disable=SC1090	
       source "$f"
   done
 else
diff --git a/core/modules/header/hooks/header/header.source.sh b/core/modules/header/hooks/header/header.source.sh
index feb526b..a3ad67d 100755
--- a/core/modules/header/hooks/header/header.source.sh
+++ b/core/modules/header/hooks/header/header.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+# shellcheck disable=SC2154
 if [ -f "$GlobalSCRIPTDIR"/script/modules/header/files/header.txt ]; then
   cat "$GlobalSCRIPTDIR"/script/modules/header/files/header.txt
 else
diff --git a/core/modules/help/commands/help/help.source.sh b/core/modules/help/commands/help/help.source.sh
index 1c4047f..7a826e2 100755
--- a/core/modules/help/commands/help/help.source.sh
+++ b/core/modules/help/commands/help/help.source.sh
@@ -1,4 +1,7 @@
+#!/bin/bash
+
 if [ -z "$GlobalARGS" ]; then
+  # shellcheck disable=SC2154
   if [ -f "$GlobalSCRIPTDIR"/script/modules/help/help.txt ]; then
     cat "$GlobalSCRIPTDIR"/script/modules/help/help.txt
   else
@@ -27,6 +30,7 @@ else
   fi
 
   if [ "$COMMANDEXISTS" == 'false' ]; then
+    # shellcheck disable=SC2154
     echo -e "$GlobalSCRIPTNAME: Invalid command $GlobalARGS"
     echo -e "See '$GlobalSCRIPTNAME usage' for available commands."
     exit 1
diff --git a/core/modules/help/commands/usage/usage.source.sh b/core/modules/help/commands/usage/usage.source.sh
index 582d20e..fc5e0dc 100755
--- a/core/modules/help/commands/usage/usage.source.sh
+++ b/core/modules/help/commands/usage/usage.source.sh
@@ -1,4 +1,7 @@
+#!/bin/bash
+
 echo -e ""
+# shellcheck disable=SC2154
 echo -e "Usage (call $GlobalSCRIPTNAME with no additional arguments to get help):"
 echo -e "-----"
 echo -e ""
@@ -7,6 +10,7 @@ echo -e ""
 echo -e "Available global arguments:"
 echo -e "-----"
 echo -e ""
+# shellcheck disable=SC2154
 if [ "$("$GlobalSCRIPTDIR"/core/modules/core/scripts/glob-exists.sh "$GlobalSCRIPTDIR"/core/modules/*/arguments/*/README.md)" == 'true' ]; then
   head -n 1 "$GlobalSCRIPTDIR"/core/modules/*/arguments/*/README.md | grep -v == | grep -v '^$'
 else
diff --git a/core/modules/help/hooks/usage/usage.source.sh b/core/modules/help/hooks/usage/usage.source.sh
index 94fdf70..a75daca 100755
--- a/core/modules/help/hooks/usage/usage.source.sh
+++ b/core/modules/help/hooks/usage/usage.source.sh
@@ -1,3 +1,6 @@
+#!/bin/bash
+# shellcheck disable=SC2154
 echo -e "Usage (call $GlobalSCRIPTNAME with no additional arguments to get help):"
 echo -e ""
+# shellcheck disable=SC2154
 echo -e "$GlobalSCRIPTNAME [command] [arguments] [parameters]"
diff --git a/core/modules/output/hooks/init/init.source.sh b/core/modules/output/hooks/init/init.source.sh
index c21d4c8..718a4b8 100755
--- a/core/modules/output/hooks/init/init.source.sh
+++ b/core/modules/output/hooks/init/init.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 function output() {
   echo "[$2] $3"
 }
diff --git a/core/modules/temporary/hooks/cleanup/cleanup.source.sh b/core/modules/temporary/hooks/cleanup/cleanup.source.sh
index 2416654..caff8aa 100755
--- a/core/modules/temporary/hooks/cleanup/cleanup.source.sh
+++ b/core/modules/temporary/hooks/cleanup/cleanup.source.sh
@@ -1,6 +1,9 @@
+#!/bin/bash
+
 if [ -z "$GlobalRUNID" ]; then
   echo -e '[error] the cleanup hook expects GlobalRUNID to be set'
   exit 1;
 else
+  # shellcheck disable=SC2154
   rm -rf "$GlobalSCRIPTDIR/tmp/$GlobalRUNID"
 fi
diff --git a/core/modules/temporary/hooks/init/init.source.sh b/core/modules/temporary/hooks/init/init.source.sh
index 90dade4..b24293d 100755
--- a/core/modules/temporary/hooks/init/init.source.sh
+++ b/core/modules/temporary/hooks/init/init.source.sh
@@ -1,7 +1,10 @@
+#!/bin/bash
+
 function tmp() {
   RUNID=$(argvalue internalrunid)
 
   LocalTEMPID=$(uuid)
+  # shellcheck disable=SC2154
   LocalTMP="$GlobalSCRIPTDIR/tmp/$RUNID/$LocalTEMPID"
   mkdir -p "$LocalTMP"
   echo "$LocalTMP"
diff --git a/core/modules/testing/scripts/assert-different.source.sh b/core/modules/testing/scripts/assert-different.source.sh
index 48ecd71..94f08ad 100644
--- a/core/modules/testing/scripts/assert-different.source.sh
+++ b/core/modules/testing/scripts/assert-different.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [ "$HAYSTACK" == "$NEEDLE" ]; then
   echo "[fail] both variables are identical: $NEEDLE == $HAYSTACK. $MESSAGE";
   ERROR=1;
diff --git a/core/modules/testing/scripts/assert-file.source.sh b/core/modules/testing/scripts/assert-file.source.sh
index 8128362..091147d 100644
--- a/core/modules/testing/scripts/assert-file.source.sh
+++ b/core/modules/testing/scripts/assert-file.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [ -f "$NEEDLE" ]; then
   echo "[pass] $MESSAGE";
 else
diff --git a/core/modules/testing/scripts/assert-identical.source.sh b/core/modules/testing/scripts/assert-identical.source.sh
index a875a6b..21ea047 100644
--- a/core/modules/testing/scripts/assert-identical.source.sh
+++ b/core/modules/testing/scripts/assert-identical.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [ "$HAYSTACK" == "$NEEDLE" ]; then
   echo "[pass] $MESSAGE";
 else
diff --git a/core/modules/testing/scripts/assert-no-file.source.sh b/core/modules/testing/scripts/assert-no-file.source.sh
index b9d5d8d..d440752 100644
--- a/core/modules/testing/scripts/assert-no-file.source.sh
+++ b/core/modules/testing/scripts/assert-no-file.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [ -f "$NEEDLE" ]; then
   echo "[fail] file $NEEDLE cannot exist. $MESSAGE";
   ERROR=1;
diff --git a/core/modules/testing/scripts/assert-not.source.sh b/core/modules/testing/scripts/assert-not.source.sh
index e69d18f..11098b1 100644
--- a/core/modules/testing/scripts/assert-not.source.sh
+++ b/core/modules/testing/scripts/assert-not.source.sh
@@ -1,2 +1,4 @@
+#!/bin/bash
+
 # shellcheck disable=SC2015
 echo "$HAYSTACK" | grep "$NEEDLE" >> /dev/null && { echo "[fail] $NEEDLE found in $HAYSTACK. Failed: $MESSAGE"; ERROR=1; } || { echo "[pass] $MESSAGE."; }
diff --git a/core/modules/testing/scripts/assert.source.sh b/core/modules/testing/scripts/assert.source.sh
index 82d2fef..a38541f 100644
--- a/core/modules/testing/scripts/assert.source.sh
+++ b/core/modules/testing/scripts/assert.source.sh
@@ -1,2 +1,4 @@
+#!/bin/bash
+
 # shellcheck disable=SC2015
 echo "$HAYSTACK" | grep "$NEEDLE" >> /dev/null && { echo "[pass] $MESSAGE"; } || { echo "[fail] $NEEDLE not found in $HAYSTACK. Failed: $MESSAGE"; ERROR=1; }
diff --git a/core/modules/testing/scripts/cleanup.source.sh b/core/modules/testing/scripts/cleanup.source.sh
index 8841de0..0e0a366 100644
--- a/core/modules/testing/scripts/cleanup.source.sh
+++ b/core/modules/testing/scripts/cleanup.source.sh
@@ -1,7 +1,11 @@
+#!/bin/bash
+
 if [[ "$ERROR" -eq 1 ]]; then
+  # shellcheck disable=SC2128
   echo -e "[error] $(basename "$BASH_SOURCE") Error has been detected, returning 1."
   exit 1
 else
+  # shellcheck disable=SC2128
   echo -e "[pass] $(basename "$BASH_SOURCE") No error detected, returning 0."
   exit 0
 fi
diff --git a/core/tests/modules/args/hooks/init/init.source.test.sh b/core/tests/modules/args/hooks/init/init.source.test.sh
index 7cc8c87..2c31a3a 100755
--- a/core/tests/modules/args/hooks/init/init.source.test.sh
+++ b/core/tests/modules/args/hooks/init/init.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/args/hooks/init/init.source.test/core/modules/args/scripts/arg-value.source.sh b/core/tests/modules/args/hooks/init/init.source.test/core/modules/args/scripts/arg-value.source.sh
index cf024e9..8506fd4 100755
--- a/core/tests/modules/args/hooks/init/init.source.test/core/modules/args/scripts/arg-value.source.sh
+++ b/core/tests/modules/args/hooks/init/init.source.test/core/modules/args/scripts/arg-value.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo "$1"
diff --git a/core/tests/modules/args/scripts/arg-value.source.test.sh b/core/tests/modules/args/scripts/arg-value.source.test.sh
index 8ad16ae..a39c338 100755
--- a/core/tests/modules/args/scripts/arg-value.source.test.sh
+++ b/core/tests/modules/args/scripts/arg-value.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/args/scripts/arg-value.source.test/core/modules/args/scripts/parse-param.source.sh b/core/tests/modules/args/scripts/arg-value.source.test/core/modules/args/scripts/parse-param.source.sh
index 57df32e..c245f90 100755
--- a/core/tests/modules/args/scripts/arg-value.source.test/core/modules/args/scripts/parse-param.source.sh
+++ b/core/tests/modules/args/scripts/arg-value.source.test/core/modules/args/scripts/parse-param.source.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [ "$1" == "test-one" ]; then
   NAME=firstname
   VALUE=firstvalue
diff --git a/core/tests/modules/args/scripts/parse-arguments.source.test.sh b/core/tests/modules/args/scripts/parse-arguments.source.test.sh
index caf8aab..6c0395f 100755
--- a/core/tests/modules/args/scripts/parse-arguments.source.test.sh
+++ b/core/tests/modules/args/scripts/parse-arguments.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
@@ -8,9 +10,9 @@ MESSAGE="$BASE/README.md must exist -- there needs to be a README file in the ba
 source ./core/modules/testing/scripts/assert.source.sh
 
 source ./core/modules/testing/scripts/cleanup.source.sh
-
+# shellcheck disable=SC2317
 PARAMS=([0]="--output-test=contains" [1]="a" [2]="space" [3]="--output-test=fully-enclosed" [4]="--output-test=partially" [5]="enclosed")
-
+# shellcheck disable=SC2317
 COMMAND=-output-test=onedash
-
+# shellcheck disable=SC2317
 ARGS=([0]="output-test-no-dash")
diff --git a/core/tests/modules/args/scripts/parse-arguments.source.test/core/modules/args/scripts/validate-command.source.sh b/core/tests/modules/args/scripts/parse-arguments.source.test/core/modules/args/scripts/validate-command.source.sh
index 2664316..3150d59 100644
--- a/core/tests/modules/args/scripts/parse-arguments.source.test/core/modules/args/scripts/validate-command.source.sh
+++ b/core/tests/modules/args/scripts/parse-arguments.source.test/core/modules/args/scripts/validate-command.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'this file is required for testing'
diff --git a/core/tests/modules/args/scripts/parse-arguments.source.test/output-test.sh b/core/tests/modules/args/scripts/parse-arguments.source.test/output-test.sh
index b3e8486..08fd9b6 100755
--- a/core/tests/modules/args/scripts/parse-arguments.source.test/output-test.sh
+++ b/core/tests/modules/args/scripts/parse-arguments.source.test/output-test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 LOCATION=$1
 GlobalSCRIPTDIR="$(pwd)/core/tests/modules/args/scripts/parse-arguments.source.test"
 shift
@@ -5,7 +7,7 @@ shift
 function debug () {
   :
 }
-
+# shellcheck disable=SC1090
 source "$LOCATION"
 
 set
diff --git a/core/tests/modules/args/scripts/parse-param.source.test.sh b/core/tests/modules/args/scripts/parse-param.source.test.sh
index fa5e2f5..7299940 100755
--- a/core/tests/modules/args/scripts/parse-param.source.test.sh
+++ b/core/tests/modules/args/scripts/parse-param.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/args/scripts/run-command.source.test.sh b/core/tests/modules/args/scripts/run-command.source.test.sh
index 6d55628..3cc73b0 100755
--- a/core/tests/modules/args/scripts/run-command.source.test.sh
+++ b/core/tests/modules/args/scripts/run-command.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/args/scripts/run-command.source.test/core/modules/whatever/commands/some-command-name/some-command-name.source.sh b/core/tests/modules/args/scripts/run-command.source.test/core/modules/whatever/commands/some-command-name/some-command-name.source.sh
index 3c3c3ab..3c684bb 100644
--- a/core/tests/modules/args/scripts/run-command.source.test/core/modules/whatever/commands/some-command-name/some-command-name.source.sh
+++ b/core/tests/modules/args/scripts/run-command.source.test/core/modules/whatever/commands/some-command-name/some-command-name.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in script'
diff --git a/core/tests/modules/args/scripts/run-command.source.test/script/modules/whatever/commands/some-command-name/some-command-name.source.sh b/core/tests/modules/args/scripts/run-command.source.test/script/modules/whatever/commands/some-command-name/some-command-name.source.sh
index ac14cc0..adc3777 100644
--- a/core/tests/modules/args/scripts/run-command.source.test/script/modules/whatever/commands/some-command-name/some-command-name.source.sh
+++ b/core/tests/modules/args/scripts/run-command.source.test/script/modules/whatever/commands/some-command-name/some-command-name.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in core'
diff --git a/core/tests/modules/args/scripts/run-command.source.test/whatever/modules/whatever/commands/some-command-name/some-command-name.source.sh b/core/tests/modules/args/scripts/run-command.source.test/whatever/modules/whatever/commands/some-command-name/some-command-name.source.sh
index fb681c4..6681d55 100644
--- a/core/tests/modules/args/scripts/run-command.source.test/whatever/modules/whatever/commands/some-command-name/some-command-name.source.sh
+++ b/core/tests/modules/args/scripts/run-command.source.test/whatever/modules/whatever/commands/some-command-name/some-command-name.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in whatever'
diff --git a/core/tests/modules/args/scripts/validate-command.source.test.sh b/core/tests/modules/args/scripts/validate-command.source.test.sh
index f8abd29..9fa44aa 100755
--- a/core/tests/modules/args/scripts/validate-command.source.test.sh
+++ b/core/tests/modules/args/scripts/validate-command.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh b/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh
index 3c3c3ab..3c684bb 100644
--- a/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh
+++ b/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in script'
diff --git a/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-only-in-core/command-only-in-core.source.sh b/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-only-in-core/command-only-in-core.source.sh
index 3c3c3ab..3c684bb 100644
--- a/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-only-in-core/command-only-in-core.source.sh
+++ b/core/tests/modules/args/scripts/validate-command.source.test/core/modules/whatever/commands/command-only-in-core/command-only-in-core.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in script'
diff --git a/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh b/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh
index 3c3c3ab..3c684bb 100644
--- a/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh
+++ b/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-in-both-core-and-script/command-in-both-core-and-script.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in script'
diff --git a/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-only-in-script/command-only-in-script.source.sh b/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-only-in-script/command-only-in-script.source.sh
index 3c3c3ab..3c684bb 100644
--- a/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-only-in-script/command-only-in-script.source.sh
+++ b/core/tests/modules/args/scripts/validate-command.source.test/script/modules/whatever/commands/command-only-in-script/command-only-in-script.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in script'
diff --git a/core/tests/modules/args/scripts/validate-command.source.test/whatever/modules/whatever/commands/command-only-in-whatever/command-only-in-whatever.source.sh b/core/tests/modules/args/scripts/validate-command.source.test/whatever/modules/whatever/commands/command-only-in-whatever/command-only-in-whatever.source.sh
index 3c3c3ab..3c684bb 100644
--- a/core/tests/modules/args/scripts/validate-command.source.test/whatever/modules/whatever/commands/command-only-in-whatever/command-only-in-whatever.source.sh
+++ b/core/tests/modules/args/scripts/validate-command.source.test/whatever/modules/whatever/commands/command-only-in-whatever/command-only-in-whatever.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'command called in script'
diff --git a/core/tests/modules/core/hooks/init/init.source.test.sh b/core/tests/modules/core/hooks/init/init.source.test.sh
index 4cfdd07..4e952c4 100755
--- a/core/tests/modules/core/hooks/init/init.source.test.sh
+++ b/core/tests/modules/core/hooks/init/init.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/core/scripts/glob-exists.test.sh b/core/tests/modules/core/scripts/glob-exists.test.sh
index 9e3fe62..97d2681 100755
--- a/core/tests/modules/core/scripts/glob-exists.test.sh
+++ b/core/tests/modules/core/scripts/glob-exists.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/core/scripts/uuid.test.sh b/core/tests/modules/core/scripts/uuid.test.sh
index 31d846e..40c8796 100755
--- a/core/tests/modules/core/scripts/uuid.test.sh
+++ b/core/tests/modules/core/scripts/uuid.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/development/commands/self-test-list/self-test-list.source.test.sh b/core/tests/modules/development/commands/self-test-list/self-test-list.source.test.sh
index bbfcd52..deca76f 100755
--- a/core/tests/modules/development/commands/self-test-list/self-test-list.source.test.sh
+++ b/core/tests/modules/development/commands/self-test-list/self-test-list.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/development/commands/self-test/self-test.source.test.sh b/core/tests/modules/development/commands/self-test/self-test.source.test.sh
index 1a3f270..fac1cbf 100755
--- a/core/tests/modules/development/commands/self-test/self-test.source.test.sh
+++ b/core/tests/modules/development/commands/self-test/self-test.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 GlobalSCRIPTDIR="$BASE"/core/tests/modules/development/commands/self-test/self-test.source.test
diff --git a/core/tests/modules/development/commands/self-test/self-test.source.test/core/modules/development/scripts/lint.source.sh b/core/tests/modules/development/commands/self-test/self-test.source.test/core/modules/development/scripts/lint.source.sh
index 3f7306e..ef9e674 100644
--- a/core/tests/modules/development/commands/self-test/self-test.source.test/core/modules/development/scripts/lint.source.sh
+++ b/core/tests/modules/development/commands/self-test/self-test.source.test/core/modules/development/scripts/lint.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'LINTER IS CALLED'
diff --git a/core/tests/modules/development/commands/self-test/self-test.source.test/test1-passing-test.sh b/core/tests/modules/development/commands/self-test/self-test.source.test/test1-passing-test.sh
index ca916d0..8c3cbfc 100755
--- a/core/tests/modules/development/commands/self-test/self-test.source.test/test1-passing-test.sh
+++ b/core/tests/modules/development/commands/self-test/self-test.source.test/test1-passing-test.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 exit 0
diff --git a/core/tests/modules/development/commands/self-test/self-test.source.test/test2-passing-test.sh b/core/tests/modules/development/commands/self-test/self-test.source.test/test2-passing-test.sh
index ca916d0..8c3cbfc 100755
--- a/core/tests/modules/development/commands/self-test/self-test.source.test/test2-passing-test.sh
+++ b/core/tests/modules/development/commands/self-test/self-test.source.test/test2-passing-test.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 exit 0
diff --git a/core/tests/modules/development/commands/self-test/self-test.source.test/test3-failing-test.sh b/core/tests/modules/development/commands/self-test/self-test.source.test/test3-failing-test.sh
index 379a4c9..d87f29e 100755
--- a/core/tests/modules/development/commands/self-test/self-test.source.test/test3-failing-test.sh
+++ b/core/tests/modules/development/commands/self-test/self-test.source.test/test3-failing-test.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 exit 1
diff --git a/core/tests/modules/development/hooks/end/end.source.test.sh b/core/tests/modules/development/hooks/end/end.source.test.sh
index 5977916..d98eb79 100755
--- a/core/tests/modules/development/hooks/end/end.source.test.sh
+++ b/core/tests/modules/development/hooks/end/end.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/development/hooks/init/init.source.test.sh b/core/tests/modules/development/hooks/init/init.source.test.sh
index 47fb2a8..1858fbb 100755
--- a/core/tests/modules/development/hooks/init/init.source.test.sh
+++ b/core/tests/modules/development/hooks/init/init.source.test.sh
@@ -1,7 +1,10 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
-function output() {
+function output() {   
+# shellcheck disable=SC2317
   echo "[$2] $3"
 }
 
diff --git a/core/tests/modules/development/hooks/init/init.source.test/core/tests/core.test.sh b/core/tests/modules/development/hooks/init/init.source.test/core/tests/core.test.sh
index fad4110..4d51ed4 100755
--- a/core/tests/modules/development/hooks/init/init.source.test/core/tests/core.test.sh
+++ b/core/tests/modules/development/hooks/init/init.source.test/core/tests/core.test.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'this file is required for tests'
diff --git a/core/tests/modules/development/hooks/init/init.source.test/core/tests/ignored.whatever.sh b/core/tests/modules/development/hooks/init/init.source.test/core/tests/ignored.whatever.sh
index fad4110..4d51ed4 100755
--- a/core/tests/modules/development/hooks/init/init.source.test/core/tests/ignored.whatever.sh
+++ b/core/tests/modules/development/hooks/init/init.source.test/core/tests/ignored.whatever.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'this file is required for tests'
diff --git a/core/tests/modules/development/hooks/init/init.source.test/ignored/tests/ignored.test.sh b/core/tests/modules/development/hooks/init/init.source.test/ignored/tests/ignored.test.sh
index fad4110..4d51ed4 100755
--- a/core/tests/modules/development/hooks/init/init.source.test/ignored/tests/ignored.test.sh
+++ b/core/tests/modules/development/hooks/init/init.source.test/ignored/tests/ignored.test.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'this file is required for tests'
diff --git a/core/tests/modules/development/hooks/init/init.source.test/script/tests/script.test.sh b/core/tests/modules/development/hooks/init/init.source.test/script/tests/script.test.sh
index 3e51f09..11880ec 100755
--- a/core/tests/modules/development/hooks/init/init.source.test/script/tests/script.test.sh
+++ b/core/tests/modules/development/hooks/init/init.source.test/script/tests/script.test.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'this file is required'
diff --git a/core/tests/modules/development/hooks/init/init.source.test/tests/tests.test.sh b/core/tests/modules/development/hooks/init/init.source.test/tests/tests.test.sh
index fad4110..4d51ed4 100755
--- a/core/tests/modules/development/hooks/init/init.source.test/tests/tests.test.sh
+++ b/core/tests/modules/development/hooks/init/init.source.test/tests/tests.test.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'this file is required for tests'
diff --git a/core/tests/modules/development/scripts/debug.source.test.sh b/core/tests/modules/development/scripts/debug.source.test.sh
index f47f211..bd58c27 100755
--- a/core/tests/modules/development/scripts/debug.source.test.sh
+++ b/core/tests/modules/development/scripts/debug.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/development/scripts/lint.source.test.sh b/core/tests/modules/development/scripts/lint.source.test.sh
index d2685e4..2cdb127 100755
--- a/core/tests/modules/development/scripts/lint.source.test.sh
+++ b/core/tests/modules/development/scripts/lint.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/extensibility/hooks/init/init.source.test.sh b/core/tests/modules/extensibility/hooks/init/init.source.test.sh
index 2b65007..7ff3c6c 100755
--- a/core/tests/modules/extensibility/hooks/init/init.source.test.sh
+++ b/core/tests/modules/extensibility/hooks/init/init.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/extensibility/scripts/invoke-all.source.test.sh b/core/tests/modules/extensibility/scripts/invoke-all.source.test.sh
index 11ca96c..056ccfb 100755
--- a/core/tests/modules/extensibility/scripts/invoke-all.source.test.sh
+++ b/core/tests/modules/extensibility/scripts/invoke-all.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/development/scripts/debug.source.sh b/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/development/scripts/debug.source.sh
index 24803c0..fd88e8f 100644
--- a/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/development/scripts/debug.source.sh
+++ b/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/development/scripts/debug.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo "$2" "$1"
diff --git a/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/whatever/hooks/some-hook/some-hook.source.sh b/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/whatever/hooks/some-hook/some-hook.source.sh
index 58b70d6..66a49f7 100644
--- a/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/whatever/hooks/some-hook/some-hook.source.sh
+++ b/core/tests/modules/extensibility/scripts/invoke-all.source.test/core/modules/whatever/hooks/some-hook/some-hook.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'Core hook called'
diff --git a/core/tests/modules/extensibility/scripts/invoke-all.source.test/script/modules/whatever/hooks/some-hook/some-hook.source.sh b/core/tests/modules/extensibility/scripts/invoke-all.source.test/script/modules/whatever/hooks/some-hook/some-hook.source.sh
index 1433a87..227b8c9 100644
--- a/core/tests/modules/extensibility/scripts/invoke-all.source.test/script/modules/whatever/hooks/some-hook/some-hook.source.sh
+++ b/core/tests/modules/extensibility/scripts/invoke-all.source.test/script/modules/whatever/hooks/some-hook/some-hook.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'Script hook called'
diff --git a/core/tests/modules/extensibility/scripts/invoke-all.source.test/something-else/modules/whatever/hooks/some-hook/some-hook.source.sh b/core/tests/modules/extensibility/scripts/invoke-all.source.test/something-else/modules/whatever/hooks/some-hook/some-hook.source.sh
index 3b7bedb..74ceb6d 100644
--- a/core/tests/modules/extensibility/scripts/invoke-all.source.test/something-else/modules/whatever/hooks/some-hook/some-hook.source.sh
+++ b/core/tests/modules/extensibility/scripts/invoke-all.source.test/something-else/modules/whatever/hooks/some-hook/some-hook.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'Random hook called'
diff --git a/core/tests/modules/header/files/header.txt.test.sh b/core/tests/modules/header/files/header.txt.test.sh
index ec692a9..be3ffa3 100755
--- a/core/tests/modules/header/files/header.txt.test.sh
+++ b/core/tests/modules/header/files/header.txt.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 BASE=$(pwd)
 
 cat "$BASE"/script/modules/header/files/header.txt
diff --git a/core/tests/modules/header/hooks/header/header.source.test.sh b/core/tests/modules/header/hooks/header/header.source.test.sh
index c32aa5d..d8038ce 100755
--- a/core/tests/modules/header/hooks/header/header.source.test.sh
+++ b/core/tests/modules/header/hooks/header/header.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 GlobalSCRIPTDIR="$(pwd)"/core/tests/modules/header/hooks/header/header.source.test
diff --git a/core/tests/modules/help/commands/help/help.source.test.sh b/core/tests/modules/help/commands/help/help.source.test.sh
index 62a68d0..22bae14 100755
--- a/core/tests/modules/help/commands/help/help.source.test.sh
+++ b/core/tests/modules/help/commands/help/help.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/help/commands/help/help.source.test/some-command/core/modules/whatever/commands/some-command/some-command.source.sh b/core/tests/modules/help/commands/help/help.source.test/some-command/core/modules/whatever/commands/some-command/some-command.source.sh
index c7383c2..dd0bd5d 100644
--- a/core/tests/modules/help/commands/help/help.source.test/some-command/core/modules/whatever/commands/some-command/some-command.source.sh
+++ b/core/tests/modules/help/commands/help/help.source.test/some-command/core/modules/whatever/commands/some-command/some-command.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'core implementation of some command'
diff --git a/core/tests/modules/help/commands/help/help.source.test/some-command/script/modules/whatever/commands/some-command/some-command.source.sh b/core/tests/modules/help/commands/help/help.source.test/some-command/script/modules/whatever/commands/some-command/some-command.source.sh
index ef5b5ab..737c268 100644
--- a/core/tests/modules/help/commands/help/help.source.test/some-command/script/modules/whatever/commands/some-command/some-command.source.sh
+++ b/core/tests/modules/help/commands/help/help.source.test/some-command/script/modules/whatever/commands/some-command/some-command.source.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 echo 'script implementation of some command'
diff --git a/core/tests/modules/help/commands/usage/usage.source.test.sh b/core/tests/modules/help/commands/usage/usage.source.test.sh
index 9bc4175..7c3000b 100755
--- a/core/tests/modules/help/commands/usage/usage.source.test.sh
+++ b/core/tests/modules/help/commands/usage/usage.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 GlobalSCRIPTNAME='some-script-name.sh'
diff --git a/core/tests/modules/help/commands/usage/usage.source.test/core/modules/core/scripts/glob-exists.sh b/core/tests/modules/help/commands/usage/usage.source.test/core/modules/core/scripts/glob-exists.sh
index f7f839f..b5c9595 100755
--- a/core/tests/modules/help/commands/usage/usage.source.test/core/modules/core/scripts/glob-exists.sh
+++ b/core/tests/modules/help/commands/usage/usage.source.test/core/modules/core/scripts/glob-exists.sh
@@ -1 +1,3 @@
+#!/bin/bash
+
 "$(pwd)"/core/modules/core/scripts/glob-exists.sh "$1"
diff --git a/core/tests/modules/help/hooks/usage/usage.source.test.sh b/core/tests/modules/help/hooks/usage/usage.source.test.sh
index 187a5f0..940c79d 100755
--- a/core/tests/modules/help/hooks/usage/usage.source.test.sh
+++ b/core/tests/modules/help/hooks/usage/usage.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 GlobalSCRIPTNAME='some-script-name.sh'
diff --git a/core/tests/modules/output/hooks/init/init.source.test.sh b/core/tests/modules/output/hooks/init/init.source.test.sh
index 7d1d0f8..e184a3b 100755
--- a/core/tests/modules/output/hooks/init/init.source.test.sh
+++ b/core/tests/modules/output/hooks/init/init.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/structure/scripts/main.test.sh b/core/tests/modules/structure/scripts/main.test.sh
index 3be25c8..8e6df5b 100755
--- a/core/tests/modules/structure/scripts/main.test.sh
+++ b/core/tests/modules/structure/scripts/main.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/temporary/hooks/cleanup/cleanup.source.test.sh b/core/tests/modules/temporary/hooks/cleanup/cleanup.source.test.sh
index f6a4c80..05b75eb 100755
--- a/core/tests/modules/temporary/hooks/cleanup/cleanup.source.test.sh
+++ b/core/tests/modules/temporary/hooks/cleanup/cleanup.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/temporary/hooks/init/init.source.test.sh b/core/tests/modules/temporary/hooks/init/init.source.test.sh
index ceffd19..56b0f28 100755
--- a/core/tests/modules/temporary/hooks/init/init.source.test.sh
+++ b/core/tests/modules/temporary/hooks/init/init.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/global-tests/files-have-tests.test.sh b/core/tests/modules/testing/global-tests/files-have-tests.test.sh
index 6dec4dd..13686e4 100755
--- a/core/tests/modules/testing/global-tests/files-have-tests.test.sh
+++ b/core/tests/modules/testing/global-tests/files-have-tests.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/global-tests/folders-contain-readme.test.sh b/core/tests/modules/testing/global-tests/folders-contain-readme.test.sh
index 2affe6a..33c2e69 100755
--- a/core/tests/modules/testing/global-tests/folders-contain-readme.test.sh
+++ b/core/tests/modules/testing/global-tests/folders-contain-readme.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
@@ -15,6 +17,7 @@ for i in $(find ./script/modules -maxdepth 1 -type d)
 do
   NEEDLE="$i"/README.md
   MESSAGE="$i/README.md must exist -- all directories need to have a README file."
+  # shellcheck disable=SC1091
   source ./script/modules/testing/scripts/assert-file.source.sh
 done
 
diff --git a/core/tests/modules/testing/scripts/assert-different.source.test.sh b/core/tests/modules/testing/scripts/assert-different.source.test.sh
index 63baacb..5313ba3 100755
--- a/core/tests/modules/testing/scripts/assert-different.source.test.sh
+++ b/core/tests/modules/testing/scripts/assert-different.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/scripts/assert-file.source.test.sh b/core/tests/modules/testing/scripts/assert-file.source.test.sh
index c6cfe7b..96ad888 100755
--- a/core/tests/modules/testing/scripts/assert-file.source.test.sh
+++ b/core/tests/modules/testing/scripts/assert-file.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/scripts/assert-identical.source.test.sh b/core/tests/modules/testing/scripts/assert-identical.source.test.sh
index 6315897..d712ba3 100755
--- a/core/tests/modules/testing/scripts/assert-identical.source.test.sh
+++ b/core/tests/modules/testing/scripts/assert-identical.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/scripts/assert-no-file.source.test.sh b/core/tests/modules/testing/scripts/assert-no-file.source.test.sh
index 8ff2b18..25756ee 100755
--- a/core/tests/modules/testing/scripts/assert-no-file.source.test.sh
+++ b/core/tests/modules/testing/scripts/assert-no-file.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/scripts/assert-not.source.test.sh b/core/tests/modules/testing/scripts/assert-not.source.test.sh
index 974ce69..058931c 100755
--- a/core/tests/modules/testing/scripts/assert-not.source.test.sh
+++ b/core/tests/modules/testing/scripts/assert-not.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/scripts/assert.source.test.sh b/core/tests/modules/testing/scripts/assert.source.test.sh
index 0a3b467..41bc55c 100755
--- a/core/tests/modules/testing/scripts/assert.source.test.sh
+++ b/core/tests/modules/testing/scripts/assert.source.test.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
diff --git a/core/tests/modules/testing/scripts/cleanup.source.test.sh b/core/tests/modules/testing/scripts/cleanup.source.test.sh
index 19bbe31..d0de6f6 100755
--- a/core/tests/modules/testing/scripts/cleanup.source.test.sh
+++ b/core/tests/modules/testing/scripts/cleanup.source.test.sh
@@ -1,18 +1,28 @@
+#!/bin/bash
+
 ERROR=0
 BASE=$(pwd)
 
 MESSAGE='cleanup exits with the proper code'
 HAYSTACK='ok'
-
+# shellcheck disable=SC2317
 source "$BASE"/core/modules/testing/scripts/cleanup.source.sh || HAYSTACK='BAD'
+# shellcheck disable=SC2317
 NEEDLE='ok'
+# shellcheck disable=SC2317
 source ./core/modules/testing/scripts/assert-identical.source.sh
+# shellcheck disable=SC2317
 HAYSTACK='ok'
+# shellcheck disable=SC2317
 ERROR=1
+# shellcheck disable=SC2317
 source "$BASE"/core/modules/testing/scripts/cleanup.source.sh || HAYSTACK='BAD'
+# shellcheck disable=SC2317
 NEEDLE='BAD'
+# shellcheck disable=SC2317
 source ./core/modules/testing/scripts/assert-identical.source.sh
+# shellcheck disable=SC2317
 ERROR=0
-
+# shellcheck disable=SC2317
 source ./core/modules/testing/scripts/cleanup.source.sh
 
diff --git a/script/modules/check/commands/check/check-single.source.sh b/script/modules/check/commands/check/check-single.source.sh
index e656350..15662f9 100644
--- a/script/modules/check/commands/check/check-single.source.sh
+++ b/script/modules/check/commands/check/check-single.source.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 MYERR=""
 DATE=$(echo | openssl s_client -servername "$SITE" -connect "$SITE":443 2>/dev/null | openssl x509 -noout -dates | grep notAfter) || MYERR="NOCERT"
 
diff --git a/script/modules/check/commands/check/check.source.sh b/script/modules/check/commands/check/check.source.sh
index 76feb0f..6789029 100755
--- a/script/modules/check/commands/check/check.source.sh
+++ b/script/modules/check/commands/check/check.source.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 DAYS=$(argvalue days)
 SITES=$(argvalue sites)
 
diff --git a/script/modules/check/commands/check/convert.source.sh b/script/modules/check/commands/check/convert.source.sh
index 3bbb00c..af0021f 100644
--- a/script/modules/check/commands/check/convert.source.sh
+++ b/script/modules/check/commands/check/convert.source.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 if hash sw_vers 2>/dev/null; then
   # On mac OS
   CONVERTEDDATE=$(date -jf "%b %d %H:%M:%S %Y %Z" -v -20S "$DATETOCONVERT" "+%s")
diff --git a/script/modules/check/commands/check/today.source.sh b/script/modules/check/commands/check/today.source.sh
index e3bb971..8b0199f 100644
--- a/script/modules/check/commands/check/today.source.sh
+++ b/script/modules/check/commands/check/today.source.sh
@@ -1 +1,2 @@
+#!/bin/bash
 TODAY=$(date     "+%b %d %H:%M:%S %Y %Z")
diff --git a/script/modules/letsencrypt-automation/convert-output-to-commands.sh b/script/modules/letsencrypt-automation/convert-output-to-commands.sh
index 175dc51..ee34835 100755
--- a/script/modules/letsencrypt-automation/convert-output-to-commands.sh
+++ b/script/modules/letsencrypt-automation/convert-output-to-commands.sh
@@ -18,8 +18,8 @@ TEST_FILE="$3"
 DOCROOT="$4"
 
 # Clear the destination and test files
-> "$DEST_FILE"
-> "$TEST_FILE"
+echo "" > "$DEST_FILE"
+echo "" > "$TEST_FILE"
 
 # Add the directory creation command to dest.txt
 echo "mkdir -p $DOCROOT/.well-known/acme-challenge" >> "$DEST_FILE"
@@ -27,6 +27,10 @@ echo "mkdir -p $DOCROOT/.well-known/acme-challenge" >> "$DEST_FILE"
 # Generate a random cache-buster value
 CACHE_BUSTER=$((RANDOM % 9999 + 1))
 
+# Track if any relevant data was written (start both as false since mkdir is always written)
+DEST_FILE_WRITTEN=false
+TEST_FILE_WRITTEN=false
+
 # Process the source file. Read lines of source.txt one by one.
 while IFS= read -r line; do
     # Trim trailing whitespace
@@ -39,6 +43,7 @@ while IFS= read -r line; do
 
         # Append to dest.txt
         echo "echo '$FILENAME' > $DOCROOT/.well-known/acme-challenge/${FILENAME%%.*}" >> "$DEST_FILE"
+        DEST_FILE_WRITTEN=true
     fi
 
     # Match the line containing the URL
@@ -48,11 +53,12 @@ while IFS= read -r line; do
 
         # Append to test.txt with the generated cache-buster value
         echo "curl -L \"$URL?cache-buster=$CACHE_BUSTER\"" >> "$TEST_FILE"
+        TEST_FILE_WRITTEN=true
     fi
 done < "$SOURCE_FILE"
 
 # Check if both files have been written
-if [[ -s "$DEST_FILE" && -s "$TEST_FILE" ]]; then
+if $DEST_FILE_WRITTEN && $TEST_FILE_WRITTEN; then
     echo "Commands written to $DEST_FILE and $TEST_FILE."
 else
     echo "An error occurred or files are empty."
diff --git a/tests/cem.test.sh b/tests/cem.test.sh
index 8fb34da..c7c593e 100755
--- a/tests/cem.test.sh
+++ b/tests/cem.test.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 set -e
 
 RESULT=$(./cem.sh internal-test /tests/cem/happy)
@@ -13,4 +14,4 @@ RESULT=$(./cem.sh internal-test /tests/cem/sad) || FAIL=1
 
 # even in the case of a failure we clean up before quitting.
 echo "$RESULT" | grep 'INVOKE CALLED' > /dev/null
-echo $FAIL | grep 1 > /dev/null
+echo "$FAIL" | grep 1 > /dev/null
diff --git a/tests/cem/happy/core/modules/extensibility/scripts/invoke-all.source.sh b/tests/cem/happy/core/modules/extensibility/scripts/invoke-all.source.sh
index b1eb4fd..aa789c3 100755
--- a/tests/cem/happy/core/modules/extensibility/scripts/invoke-all.source.sh
+++ b/tests/cem/happy/core/modules/extensibility/scripts/invoke-all.source.sh
@@ -1 +1,2 @@
+#!/bin/bash
 echo "INVOKE CALLED WITH $1"
diff --git a/tests/cem/happy/core/modules/structure/scripts/main.sh b/tests/cem/happy/core/modules/structure/scripts/main.sh
index b3cd672..6671688 100755
--- a/tests/cem/happy/core/modules/structure/scripts/main.sh
+++ b/tests/cem/happy/core/modules/structure/scripts/main.sh
@@ -1 +1,2 @@
+#!/bin/bash
 echo "MAIN SCRIPT CALLED WITH $*"
diff --git a/tests/cem/sad/core/modules/extensibility/scripts/invoke-all.source.sh b/tests/cem/sad/core/modules/extensibility/scripts/invoke-all.source.sh
index b1eb4fd..aa789c3 100755
--- a/tests/cem/sad/core/modules/extensibility/scripts/invoke-all.source.sh
+++ b/tests/cem/sad/core/modules/extensibility/scripts/invoke-all.source.sh
@@ -1 +1,2 @@
+#!/bin/bash
 echo "INVOKE CALLED WITH $1"
diff --git a/tests/cem/sad/core/modules/structure/scripts/main.sh b/tests/cem/sad/core/modules/structure/scripts/main.sh
index 379a4c9..afe8ade 100755
--- a/tests/cem/sad/core/modules/structure/scripts/main.sh
+++ b/tests/cem/sad/core/modules/structure/scripts/main.sh
@@ -1 +1,2 @@
+#!/bin/bash
 exit 1
diff --git a/tests/letsencrypt-automation-tests/test.sh b/tests/letsencrypt-automation-tests/test.sh
index cbe4816..9736b2e 100755
--- a/tests/letsencrypt-automation-tests/test.sh
+++ b/tests/letsencrypt-automation-tests/test.sh
@@ -31,7 +31,7 @@ empty_file_if_exists() {
     local FILE="$1"
 
     if [[ -e $FILE ]]; then
-        > "$FILE"  # Empty the file
+        echo "" > "$FILE"  # Empty the file
     fi
 }
 
@@ -130,24 +130,20 @@ echo file_two.txt > ./docroot/.well-known/acme-challenge/file_two.txt" >> ./unve
 
   # Define the file and string to search for
   FILE="./unversioned/test2-actual-test.txt"  # Replace with your actual file name
-  SEARCH_STRING2='curl -L "http://example.com/.well-known/acme-challenge/file_one.txt?cache-buster='
+  SEARCH_STRING_ONE='curl -L "http://example.com/.well-known/acme-challenge/file_one.txt?cache-buster='
 
   # Call the function
-  check_string_in_file "$FILE" "$SEARCH_STRING1"
-
-  # Call the function
-  if check_string_in_file "$FILE" "$SEARCH_STRING1"; then
+  if check_string_in_file "$FILE" "$SEARCH_STRING_ONE"; then
     echo "Test case 2.1 passed."
   else
     echo "Test case 2.1 failed."
     return 1  # Return failure
   fi
 
-  SEARCH_STRING2='curl -L "http://example.com/.well-known/acme-challenge/file_two.txt?cache-buster='
-  check_string_in_file "$FILE" "$SEARCH_STRING2"
+  SEARCH_STRING_TWO='curl -L "http://example.com/.well-known/acme-challenge/file_two.txt?cache-buster='
 
   # Call the function
-  if check_string_in_file "$FILE" "$SEARCH_STRING2"; then
+  if check_string_in_file "$FILE" "$SEARCH_STRING_TWO"; then
     echo "Test case 2.2 passed."
     return 0  # Return success
   else
@@ -197,7 +193,7 @@ run_test_case_4() {
 # Function for Empty Source File Test
 run_test_case_5() {
     echo "Running Empty Source File Test..."
-    >./unversioned/test5-source.txt  # Create an empty source file
+    echo "" > ./unversioned/test5-source.txt  # Create an empty source file
     OUTPUT=$($SCRIPT_PATH ./unversioned/test5-source.txt ./unversioned/test5-dest.txt ./unversioned/test5-test.txt ./docroot 2>&1)
 
     # Check for the specific error message