Jul 11, 2024 · Some of the most convenient ‘tricks’ on Linux depend on the use of a handful of special characters. This post looks at a number of command operators on Linux and shows how they work.

Jul 6, 2024 · These arguments are accessible within the script using a set of special dollar sign variables called positional parameters. Furthermore, we can use them to interact with user-provided data and …

Sep 14, 2012 · They are all documented in the bash man page. The only oddity is that $_ is only mentioned in the context of its use in the MAILPATH variable.

In this section you’ve learnt about the dangers of the root account, and how modern Linux systems like Ubuntu try to reduce the risk of danger by using sudo. But any use of superuser powers should be …

Oct 3, 2025 · That sequence of strange symbols on the Bash command line must mean something, right? We're breaking down special characters and how to use them.

Sep 27, 2015 · In this example we tell wc program to wait for EOF string, then type in five words, and then type in EOF to signal that we're done giving input. In effect, it's similar to running wc by itself, …

Explore the various special variables in Unix, their usage, and how they can enhance your scripting and command line experience.

Feb 20, 2011 · In simpler terms, it's the exit status of the last command. Cjm's answer is correct, but $? can be used in silly ways in shell scripts, and I'd like to warn against that. A lot of bad shell scripts …

Why Use Bash? It is widely available on Unix/Linux systems, making scripts portable. Supports powerful scripting features, including loops, conditionals, and functions. Provides command history and tab …

Apr 4, 2023 · Recently, I covered how you can use the number of arguments in bash that involved the use of the $# variable which is one of the special variables of bash. And in this guide, I will walk you …