Perl and CGI Miscellaneous Pipes and Command Line Variables in Perl Tutorial

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Tutorial: Perl and CGI Miscellaneous Pipes and Command Line Variables in Perl Tutorial

This tutorial walks through handling pipes and command line variables in a Perl script.

Tutorial Details:

Pipes and Command Line Variables in Perl

This tutorial walks through handling pipes and command line variables in a Perl script.
Automatic File Looping
In Unix, files can be ?piped? to programs. Programs also can accept filenames on the command line.

If your program expects files as input, you can easily make it work with both command line filenames and files piped to it.

The built-in variable ?$_? is the current line of whatever it is we?re looking at through the loop. We?ll talk about the <> construction later. Basically, it opens up every file in the array @ARGV or whatever was piped to the program if there is no array @ARGV.

There are a few new items in there. The ?shift? function takes the first item out of an array and returns it to the scalar variable on the left of the equation. It removes that item completely from the array. So, if @ARGV had five items before this, it now has only four.
The comparison ?/$SearchText/? is like ?eq? except that it looks for the text anywhere inside the current line. This is a regular expression, and we?ll talk more about that in a later chapter.

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