fsed: Mass file renaming using sed syntax

fsed

#!/bin/sh

if [ "$1" = '-f' ]
then
	fflag='1'
	shift
fi

while read i
do
	test "$i" = '' && continue

	bn=$(basename "$i")
	dn=$(dirname "$i")
	nbn=""

	nbn=$(echo $bn | sed "$@")

	[ "$bn" != "$nbn" ] \
		&& cmd="$cmd mv \"$dn/$bn\" \"$dn/$nbn\";"
	nfls="$nfls$F$dn/$nbn"
	F=':' # don't start with a delimeter
done

if [ ! "$cmd" = "" ]
then
	if [ ! "$fflag" = 1 ]
	then
		{
			echo $cmd | sed 's/; /\
/g'
			printf "Continue? (y/N): "
	
			read resp </dev/tty
			resp=$(echo $resp | sed -E 's/(.).*/\1/')
	
			echo
		} 1>&2
	
		case $resp in
		Y|y)
			;;
		N|n|*)
			exit 1
			;;
		esac
	fi

	eval $cmd
fi

echo $nfls | tr ':' '\n'

Should work on most posix systems, pipe a list of files to this, and use sed commands and flags to edit the filenames. It prompts you before making changes. Doesn't handle files with newlines or colons in them (Or, it'll try, but will explode)