#!/bin/sh -u
#
# Exec command only if input is not empty.
#	- Cameron Simpson <cs@zip.com.au> 23jun1998
#

: ${TMPDIR:=/tmp}

cmd=$0
usage="Usage: $cmd command [args...]"

[ $# = 0 ] && { echo "$usage" >&2; exit 2; }

tmp=$TMPDIR/execif.$$
trap 'rm -f "$tmp"' 0
trap 'rm -f "$tmp"; exit 1' 1 2 13 15

stripwhite >"$tmp" || exit 1
[ -s "$tmp" ] || exit 0
"$@" <"$tmp"