As stated in perldoc:/perlrun (well worth the read for great switches like -e, -n, -p, -a, and others), it provides some really basic parsing of command-line options.
perl -sle 'print $foo' -- -foo=bar
# prints: bar
Another (and much more flexible) option for command-line option parsing is Getopt::Long.
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You know, I don't recall off the top of my head. But I can tell you when I'm curious about such matters, I generally consult perlrun.
You may see if that helps you find an answer.
$/ = q#(\w)# ; sub sig { print scalar reverse join ' ', @_ }
+ sig
map { s$\$/\$/$\$2\$1$g && $_ } split( ' ', ",erckha rlPe erthnoa stJu
+" );
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