UNIX related tutorial/FAQ

Unix Basics Quiz

last updated March 22, 2020 in UNIX

Let us test your basic knowledge of Unix systems, including commands.

last updated March 10, 2020 in BASH Shell, Linux, UNIX

Let us test your basic knowledge of Linux systems, including commands.

last updated February 29, 2020 in Linux, UNIX, Vim

How do I show line numbers in Vim by default on Linux?

last updated February 13, 2020 in Linux, UNIX, Vim

How do I undo a recent change in the vim text editor?

How do I see how many processes are running in Linux? How can count all running processes in Linux?

last updated December 20, 2019 in Linux, Mac OS X, Troubleshooting, UNIX, Windows

How do I remove Santa Hat in VLC media player that displayed during Christmas time during 18th December to 1st January?

last updated December 12, 2019 in Linux, Networking, UNIX, Windows

How do I see Time-To-Live (TTL) for a DNS record using Linux, macOS, *BSD, or Unix-like systems command line option? How do I find my DNS TTL?