replace.sh

#!/bin/sh
# script for replacing multiple files
#
# usage: ./replace.sh [directory] [filter] [before] [after]
#
# ex) replace "e" to "a" for all htm/html file in current dir
#     # ./replace . 'html?$' e o

if [ $# -eq 0 ]
then
	echo "usage: ./replace.sh [directory] [filter] [before] [after]"
	echo ""
	echo "ex) replace 'e' to 'a' for all htm/html file in current dir"
	echo "    # ./replace . 'html?$' e o"
else
	list=`find $1 | egrep -e $2`
	for file in ${list[@]}
	do
		sed s/$3/$4/g $file > "$file.tmp"
		mv $file "$file.back"
		mv "$file.tmp" $file
	done
fi