Linux Shells and Utilities Ten Neat Tricks With Perl Tutorial

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Tutorial: Linux Shells and Utilities Ten Neat Tricks With Perl Tutorial

Automate redundant repetitive tasks with Perl, using these ten neat tricks!

Tutorial Details:

Linux Shells and Utilities Ten Neat Tricks With Perl

When I am using a computer to do a job I often think 'I am repeating tasks...time to write a script'. Under Linux there are a number of programming systems for scripts. Below we will look at one of them, Perl. Perl is a full blown programming language, but it's good for making short, quickly written programs like scripts. This is because it has a rich set of features and also a wide range of add-on libraries.

Here are ten one liners in perl, illustrating the kinds of task one would use a script for under linux. All the scripts take some kind of argument after the final ' quote that signals the end of the program.

1. perl -p -i -e 's/this/that/g' filename
Search and replace the string 'this' with the string 'that' in the file filename. You can also say * or *.html or any valid wildcard expression instead of filename. The s/// command uses regular expressions. If you want to alter the 'this' and 'that', it's best to avoid .*?[]{}$^ and other odd characters which act as metacharacters in regular expressions. Or better still look at the perlre documentation page. You can do this by saying perldoc perlre . Perl has extensive online documentation, try perldoc perltoc for a list.

2. perl -e 'for (@ARGV) { rename $_, lc($_) unless -e lc($_); }' *
Rename all the files in the current directory to lower case. The $_ is a sort of 'default' variable which is widely used in Perl.

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