According to perlvar for $):
The first number sets the effective gid, and the rest (if any) are passed to setgroups(). To get the effect of an empty list for setgroups(), just repeat the new effective gid
$) = "$gid $gid";
The following code on my machine (NetBSD):
my( $uid, $gid ) = qw/32767 32766/;
setgid( $gid ); $) = "$gid $gid"; $( = $gid; die "Set group ($gid): $!
if ( $( != $gid ) or ( $) != $gid );
setuid( $uid ); $> = $uid; $< = $uid; die "Set user ($uid): $!"
if ( $< != $uid ) or ( $> != $uid );
uid=32767(nobody) gid=32766(nogroup) groups=32766(nogroup)
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