Perl references: create, dereference and debug with confidence
Learn enough to be dangerous with one of Perl’s most powerful features
Perl hash basics: create, update, loop, delete and sort
Hashes are one of Perl’s core data types. This article describes the main functions and syntax rules for for working with hashes in Perl.
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Dynamic variable names with a dereferencing block
Perl is remarkably flexible and allows you to achieve all kinds of wizardry with the language. One example of this is using a dereferencing block to use a scalar value as a variable name. This allows you to use variables with dynamic names.
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Test if the user is root
When Perl is executing a program, it maintains the user id of the process owner in a global variable ($<). When a Perl program is executed by root or a user with root privileges (e.g. using the sudo command), the user id variable is always set to zero. This can be checked at the command line:
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Upgrade your list printing using field separator variables
A typical way to print every element of an array in Perl is using a foreach loop:
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Quoting strings in Perl - even ones containing apostrophes and quote or speech marks
Broadly speaking Perl has two types of strings: quotes that are interpolated at runtime and literal quotes that are not interpolated. Let’s review each of these in turn.
