#!/bin/sh
# replace - UNIX shell script for text replacement over several files
# using sed.
# George Ruban gruban@geocities.com 2/5/97
# http://www.geocities.com/SiliconValley/Vista/2013
# GR 3/6/97 - added from/to parameter slash escaping

# check command line arguments
if [ "$#" -lt 3 ]
then
	echo "Usage: replace from to files..."
	exit 1
fi

# get from and to parameters
# escape any slashes in the parameters with backslashes
from=`echo "$1" | sed 's/\//\\\\\//g'`
to=`echo "$2" | sed 's/\//\\\\\//g'`

# prepare file names for looping over
shift 2

# do the work: loop over supplied command line files
for file
do

#	try the replacement to a temporary file
	echo "replacing '$from' with '$to' in $file..."
	tempname=/tmp/`basename $file`.$$
	if sed "s/$from/$to/g" "$file" > "$tempname"

# if it succeeded, replace the original
	then
		mv "$tempname" "$file"
	fi
done