#!/bin/bash

##==============================================================================
##
## sub
##
## Usage: sub file1 file2 ...
##
## This utility applies the SED script /tmp/sub.sed to all files given as 
## arguments.
##
## The original files are first moved to a directory called ".rsub".
##
##==============================================================================

SUB_SED=/tmp/sub.sed

# Check arguments:

if [ "$#" == "0" ]
then
    echo "Usage: $0 file1 file2 ..."
    echo
    exit 1
fi

# Be sure $SUB_SED exits.

if [ ! -f $SUB_SED ]
then
    echo "$0: $SUB_SED not found"
    exit 1
fi

# Perform substitution on each file.

for i
do
    if [ -f $i ]
    then
	mv $i $i.bak
	sed -f /tmp/sub.sed $i.bak > $i
    else
	echo "$0: warning: $i not found"
    fi
done