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# $FreeBSD$
: &
p1=$(jobid)
p2=$(jobid --)
p3=$(jobid %+)
p4=$(jobid -- %+)
[ "${p1:?}" = "${p2:?}" ] && [ "${p2:?}" = "${p3:?}" ] &&
[ "${p3:?}" = "${p4:?}" ] && [ "${p4:?}" = "${p1:?}" ]
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