1# $FreeBSD: head/tools/regression/bin/sh/execution/set-x2.0 222882 2011-06-08 21:58:19Z jilles $ 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