12.4-File_renamer_simple.sh

 #!/bin/bash
 # renames.sh
 # basic file renamer

     criteria=$1
     re_match=$2
     replace=$3
     
     for i in $( ls *$criteria* ); 
     do
         src=$i
         tgt=$(echo $i | sed -e "s/$re_match/$replace/")
         mv $src $tgt
     done