On a Linux or UNIX-based system, ls is one of the most useful commands you can know. Fundamentally, it tells you information of files and folders on your system - and is extremely useful when you only have access to a server or computer via a terminal window. Let's look at how it works, and discuss some of the features of ls that you may not know.
The syntax for ls looks like this, where [OPTIONS] are optional settings, and [FILE|FOLDER] is an optional link to the file or folder we want to check. If we only type ls, it will check the current folder.