Linux's which command returns three types of exit codes: 0 when all specified files are located and can run, 1 when at least one command is not executable, and 2 when an unrecognized option is used.

Learn what a shell "builtin" on a Linux system is, as well as what commands identify builtins and allow you to retrieve useful information about your working environment. and how to determine if a ...

Remove duplicate lines with uniq. If you don’t need to preserve the order of the lines in the file, using the sort and uniq commands will do what you need in a very straightforward way. The sort ...

In another entry of his Linux 101 series, Jack Wallen shows you how to delete files and folders from Linux using the Command Line Interface (CLI).

Before we actually execute the file, issue the command chmod u+x checksudio.sh. Now, issue the command ./checksudo.sh and you should see printed “You must run this script with sudo privileges.” ...

I've downloaded an executable file, but it doesn't execute, why? In Linux (and other *nix systems) whether a file is executable or not depends solely on its permissions, not on its extension or ...

The find Command: Searching for Large Files. The find command in Linux is a powerful utility for seeking out files that meet specific criteria. To hone in on large files, we can employ the find ...

I recently had the need to embed a file in an executable. Since I'm working at the command line with gcc, et al and not with a fancy RAD tool that makes it all happen magically it wasn't immediately ...

In addition to Linux, Windows includes a finger.exe command that performs the same functionality. To execute the Finger command, a user would enter finger [user]@[remote_host]. For example, finger ...

If you’re a Steam fan running Linux, the last thing you’ll want to do in the next few days is mess with your Steam files. Users on Valve’s GitHub Steam for Linux page are complaining about a ...