#! /bin/sh

#================================================================
# edswap
# Swap strings with ed command
#================================================================


# check arguments
if [ $# -lt 3 ]
then
  printf 'edswap: usage: edswap regex string files...\n' 1>&2
  exit 1
fi


# make expressions
bef=`printf "$1" | sed 's/\//\\\\\//g'` ; shift
aft=$1 ; shift


# edit files
while [ -n "$1" ]
do
  printf "== $1 ==\n"
  printf "1,\$ s/$bef/$aft/g\nw\n" | ed "$1"
  shift
done


# exit normally
exit 0



# END OF FILE