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#!/bin/sh
# Run ed(1) over multiple files, duplicating stdin.
self=edda
# Need at least one file
if [ "$#" -eq 0 ] ; then
printf >&2 'edda: Need at least one file\n'
exit 2
fi
# Create a temporary directory with name in $td, and handle POSIX-ish traps to
# remove it when the script exits.
td=
cleanup() {
[ -n "$td" ] && rm -fr -- "$td"
if [ "$1" != EXIT ] ; then
trap - "$1"
kill "-$1" "$$"
fi
}
for sig in EXIT HUP INT TERM ; do
# shellcheck disable=SC2064
trap "cleanup $sig" "$sig"
done
td=$(mktd "$self") || exit
# Duplicate stdin into a file
script=$td/script
cat >"$script" || exit
# Run ed(1) over each file with the stdin given
for file ; do
ed -- "$file" <"$script"
done
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