SysAdmin

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.

The free command in Linux is a utility that helps monitor RAM usage on a system. This guide shows how to use the free command and determine if there are enough resources for running new apps.

Jenkins is an open-source automation server used for automating code development. In this tutorial, we show you how to use environment variables in Jenkins to make automation even easier.

Bash scripting is a key skill for both system administrators and developers. Learn how to write a Bash through a practical example.

Although the builtin declare statement does not need to be used to explicitly declare a variable in Bash, the command is often used for more advanced variable management tasks. This tutorial shows how to use the declare command to set and display the variables and their attributes.