#!/bin/bash

if test $# -lt 3 -o $# -gt 4 ; then
   echo
   echo Usage: $0 directory_name old_suffix new_suffix [just_test]
   echo
   echo Change recursively all the files ending in .old_suffix to end in .new_suffix
   echo If just_test is present, then the files are not renamed, but just
   echo written to the output.
   echo
   echo "Example: $0 c cc           Change all .c files to be .cc"
   echo "         $0 c CC test      Write which files would be changed"
else

initdir=$1
old_suffix=$2
new_suffix=$3
just_test=$4

for file in $initdir/* ; do
    if test -d $file ; then
       $0 $file $old_suffix $new_suffix $just_test
    else
        if test -z "${file##*\.$old_suffix}" ; then
           basename="${file%*\.$old_suffix}"
           newname=${basename}.$new_suffix
           if test -n "$just_test" ; then
              echo $file would be moved to ${newname}
           else
              echo Moving $file to ${newname}
              /bin/mv $file ${newname}
           fi
        fi
    fi
done

fi