xref: /freebsd/bin/sh/tests/execution/set-x3.0 (revision a64729f5077d77e13b9497cb33ecb3c82e606ee8)
1
2key='must contain this'
3PS4='$key+ '
4{ r=`set -x; { :; } 2>&1 >/dev/null`; } 2>/dev/null
5case $r in
6*"$key"*) true ;;
7*) false ;;
8esac
9