This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. It also runs any code in BEGIN blocks and will check any modules you have used in your program. Perl has a special variable $. There are several modules that prefer to be run this way (such as CPAN and Devel::Cover). Perl's -n switch allows you to run a program (usually specified with -e) against every line on standard input. The options are also called switches because they can turn on or turn off different behaviors. For complete information on these and other command line options, consult the perlrun manual page. If you wrote pr in Perl and entered the command line shown above, then at the beginning of program execution @ARGV would have six elements: The perl interpreter takes each -e argument as a fragment of Perl code and executes it. Switch -ssw Compress locked files. Now the command line invocation looks something like this: perl pgrep.pl -r
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