SysAdmin

The Bash let command is a built-in utility used for evaluating arithmetic expressions. Learn how to use the Bash let command in this tutorial.

The dmesg utility allows you to inspect the kernel ring buffer and check for errors during system startup. This tutorial shows how to use the dmesg command.

Jenkins seems overwhelming when just starting out. Follow our guide to learn how to set up and use Jenkins through hands on tutorials.

Access to Domain Name System (DNS) records of a website is important for troubleshooting network related problems. This tutorial will introduce nslookup, a cross-platform command for querying servers and obtaining domain records.

The head commands lists the first ten lines of a file in standard output. Learn how to use the head command and its options (with examples).

FTP offers an efficient method of transferring files within a secure network. Learn how to use the ftp command in this tutorial.

All the variables the user defines inside a shell are local by default. It means that child processes of the shell do not inherit the values of the shell's variables. To make them available to child processes, the user must export the variables. This tutorial will show you how to export Bash variables in Linux, using the export command.

Jenkins is an open-source automation server for code development. Jenkins logs offer a wealth of information about your projects and the Jenkins app itself.

Jenkins uses port 8080 by default, but it also lets users set a custom port. This tutorial shows you how to change the default Jenkins port in Windows, Linux, and macOS.

Use the diff command to compare files line-by-line and see how to modify them to make them identical.