apg-word

#!/bin/bash
set -eu

# non-separators are for reference only, verified against apg 2.2.3
separators=\''!"$()*;<>[\]^`{|}'
non_separators='#%&+,-./:=?@_~'

usage() {
    cat >&2 <<EOM
usage: $(basename "$0") [OPTIONS] LENGTH [NUM_OF_PASS]

Generate random passwords using apg that have no punctuation characters that
gnome-terminal considers to be word separators.

There are 14 non-separators, so with default options (i.e. not pronounceable),
there are 76 possible symbols and generated passwords should have 6.248 bits of
entropy per character.

       chars   entropy
         12      75
         16      100
         20      125
         41      256


Punctuation according to gnome-terminal:
    word separators: $separators
    non separators:  $non_separators


OPTIONS:

  -h    show this help message
  -p    generate pronounceable passwords (default is purely random)

EOM
}

pronounceable=
num_of_pass=1

while getopts hp OPT; do
    case "$OPT" in
        p)
            pronounceable=1
            ;;
        h)
            usage
            exit 0
            ;;
        \?)
            usage
            exit 1
            ;;
    esac
done

shift $((OPTIND-1))

if [ $# -lt 1 ]; then
    usage
    exit 1
fi

length="$1"

if [ $# -ge 2 ]; then
    num_of_pass="$2"
fi

if [ -n "$pronounceable" ]; then
    opts="-a 0"
else
    opts="-a 1"
fi

set -x
apg $opts -M sncl -E "$separators" -n "$num_of_pass" -m "$length" -x "$length"