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

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Another (and much more flexible) option for command-line option parsing is Getopt::Long.

In reply to Re: -s option by davidrw
in thread -s option by ur_tr

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