In Bash, a hash is a data structure that can contain many sub-variables, of the same or different kinds, but indexes them with user-defined text strings, or keys, instead of fixed numeric identifiers.

Environment variables are very helpful to use in scripts and are sometimes necessary to be manually set when installing certain software. Start using them now to make Linux and the Linux command ...

The bash man page will tell you a little about the eval command, though you would have to scroll down nearly 5,000 lines to find it. There are, after all, no man pages for built-ins. Here’s what ...

We've explored just about everything you can do with variables other than delving into arrays, which we'll do next month, so I thought I'd take a bit of space to show you a few slick command ...

Array is like a variable. So it is created using declare, with -a option or just direct assignment: $ declare -a ARRAY0$ $ ARRAY1=(0 1 2) ... Bash executes the most recent command that matches. For ...

A multi-dimensional array would be better, but Bash doesn't offer any support for that particular data structure. There's a workaround by using an associative array, but that requires Bash 4.x, and ...