1# $FreeBSD: src/tools/regression/bin/sh/execution/set-x2.0,v 1.1 2011/06/08 21:58:19 jilles Exp $ 2 3key='must contain this' 4PS4="$key+ " 5{ r=`set -x; { :; } 2>&1 >/dev/null`; } 2>/dev/null 6case $r in 7*"$key"*) true ;; 8*) false ;; 9esac 10