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#!/bin/sh
set -e
[ -n "$DEBUG" ] && set -x
append=
while getopts ah opt; do
case "$opt" in
a) append=1 ;;
h | ?)
printf "usage: %s [-ah]\n\n" "$(basename "$0")"
exit 2
;;
esac
done
shift $((OPTIND - 1))
outname=$1
tmpfile=$(mktemp)
trap '{ rm "$tmpfile"; }' EXIT
cat - >"$tmpfile"
if [ -n "$outname" ]; then
(
if [ -n "$append" ]; then
tee -a "$outname" >/dev/null
else
tee "$outname" >/dev/null
fi
) <"$tmpfile"
else
cat "$tmpfile"
fi
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