#!/bin/sh

# replace: replace str1 in files with str2 in place.

PATH=/bin:/usr/bin

case $# in
    0|1|2) echo 'Usage: replace str1 str2 files' 1>&2; exit 1
esac

left=$1; right=$2; shift; shift

for i
do
    # Use @ instead of / in sed delimiter to reduce conflicts with the input
    # strings.
    ~/bin/overwrite $i sed "s@$left@$right@g" $i
done