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  1. or download this
    #!/usr/bin/perl

...
   my $permission = get_data($pattern);
   print($permission);
}
  2. or download this
    #!/usr/bin/perl

...
   my $permission = get_data($pattern);
   print($permission);
}
  3. or download this
    #!/usr/bin/perl

...
   my $re = qr/\b(?:$pattern)\b/;
   print(grep /$re/, @etc_passwd);
}