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#!/usr/bin/env bash
#
# edda(1) -- Run ed(1) over multiple files, duplicating stdin. Example:
#
# $ edda -s /etc/app.d/*.conf <<EOF
# ,s/foo/bar/g
# w
# EOF
#
# Author: Tom Ryder <tom@sanctum.geek.nz>
# Copyright: 2015
# License: Public domain
#
# Name self
self=edda
# Define usage function
usage() {
printf 'USAGE: %s [OPTS] [--] FILE1 [FILE2...]\n' "$self"
}
# Need at least one file
if ! (($#)) ; then
usage >&2
exit 1
fi
# Need ed(1) -- some systems daring to call themselves UNIX-like don't have it
# installed by default. What's POSIX, precious?
hash ed || exit
# Parse options out, give help if necessary
declare -a opts
for arg ; do
case $arg in
--help|-h|-\?)
usage
exit
;;
--)
shift
break
;;
-*)
shift
opts=("${opts[@]}" "$arg")
;;
esac
done
# Duplicate stdin into a file, which we'll remove on exit
stdin=$(mktemp -dt "$self".XXXXXX) || exit
cleanup() {
rm -f -- "$stdin"
}
trap cleanup EXIT
cat > "$stdin"
# Run ed(1) over each file with the options and stdin given
for file ; do
ed "${opts[@]}" -- "$file" < "$stdin"
done
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