Thesl
in Linux/Unix operating systems is an interesting and unusual command that serves to entertain and practice command line skills.
What the sl command does
When you type the sl
command in the terminal, an animation of a train appears as it travels horizontally across the screen. This command is commonly used to defuse and have a fun "pause" in your terminal activity.

Although sl
is frivolous, it can be a useful way to check if the command line is working properly and to display information about the current user. If you accidentally type sl
instead of another command, you can quickly abort the command by pressing Ctrl+C
. Although the sl
command doesn't have any real practical applications, it can bring a smile and amusement to the command line.