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ubixos / bin / sh / tests / execution / set-x3.0

Charlie Root on 16 Jan 2018 229 bytes BSD Shell

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# $FreeBSD: releng/11.1/bin/sh/tests/execution/set-x3.0 222907 2011-06-09 23:12:23Z jilles $

key='must contain this'
PS4='$key+ '
{ r=`set -x; { :; } 2>&1 >/dev/null`; } 2>/dev/null
case $r in
*"$key"*) true ;;
*) false ;;
esac