These are stupidly simple, but I found it useful for quick hacks: 
my %ARGS = map {$_,1} @ARGV;

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To scripts that need a "toggle" option. Example:
perl script.pl option_foo

Testing it: 

if($ARGS{foo}) { ... }

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Another is: 
my %ARGS = @ARGV;

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To simple-word options:

perl script.pl expire 100 rebuild all 

if($ARGS{rebuild} eq 'all') { ... }

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In reply to Poor's man command line arguments by zjunior

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