#! /bin/bash

tmpfile="$(mktemp "${TMPDIR:-/tmp}"/collected-output-XXXXXXXX)"

cleanup ()
{
    /bin/rm -f "$tmpfile"
}

trap 'ec=$?; cleanup; exit $ec' EXIT INT TERM QUIT

"$@" > "$tmpfile" 2>&1
res=$?
[[ "$res" = 0 ]] || cat "$tmpfile"
exit "$res"