Perl uses a special command line option ‘-s’ to facilitate the option handling for scripts. In this example, we will print a welcome message with the users name as the argument from the command line. -w. This turns on warnings in Perl; for example, using this flag will cause Perl to warn you about uninitialized variables in your program. In this way Perl can replace grep | sed in a single one-liner.. For example: perl -ne 'print "$1\n" if /Messages read: (\d+)/'
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