Basics

Every system administrator got this error at least one time in a shell : “bash : command not found“. However, you were pretty sure that you wrote the command correctly,…

After creating disk partitions and formatting them properly, you may want to mount or unmount your drives. On Linux, mounting drives is done via mountpoints on the virtual filesystem, allowing…

As a system administrator, you may be asked to manage disks between different operating systems such as Windows, Linux and MacOS. As a consequence, you may have to format your…

This tutorial discusses the ways to check disk space on Linux using the command line or graphical tools. As a system administrator, you always want to make sure that you…

As a system administrator, creating partitions on Linux for your disks is a very common task. You may want for example to add some extra space to some directories on…

On Linux, hidden files are files that are not directly displayed when performing a standard ls directory listing. Hidden files, also called dot files on Unix operating systems, are files…

On Linux, knowing how to set and unset environment variables is essential to manage your hosts. Environment variables are a set of key value pairs stored on your Linux and…

This tutorial focuses on the techniques to set the date and time on Linux using timedatectl, NTP or date. As a system administrator, you may be asked to set the…

On Linux, there are many ways to change the current user for the session. If you are not using a graphical interface, you might wonder how you can change the…

This tutorial focuses on user administration on Linux hosts, managing users and groups. As a system administrator, you are manipulating users and groups all the time. You may be required…