SysAdmin

Environment variables store values that help build the system environment and run processes.
In this tutorial, learn how to set, view, and unset environment variables in macOS.

In order to properly track your changes and push them to Git, you need to set a remote upstream branch. Learn about upstream branches and how to set them in this tutorial.

To avoid compatibility problems when implementing new PHP-related features or debugging a website, it is useful to know the PHP version you are working with. This tutorial explains how to check the PHP version running on your website or a local machine.

The ifconfig command is a tool for network interface management that is used to enable/disable interfaces, manage IP addresses, netmasks, MAC addresses, etc. This tutorial shows how to install and use the ifconfig command on CentOS 7.

The umask command on Linux lets you interact with your system's default permissions and fine-tune permissions for new files and folders.
This tutorial shows you what umask is, how it works, and how best to use it.

The Kubernetes command-line tool, kubectl, allows you to control Kubernetes by carrying out HTTP requests to the Kubernetes API. This reference guide provides a list of the most common kubectl commands, along with a handy, downloadable cheat sheet.

Environment variables play a significant role in setting up the system and shell configuration at the beginning of every shell session. This tutorial explains how to view, set, manage, and unset environment variables in Linux.

Proxy servers are commonly found on local business networks, providing an additional security layer. Among personal users, they are popular because they help increase privacy and speed. This tutorial shows how to set up a proxy on Ubuntu 20.04.

CentOS 8 was released in 2019 and brought promising features to the popular Linux distro. Although it had an EOL scheduled for 2029, it was cut short with RHEL ending support of CentOS 8 in December 2021. Learn more about the sudden change and what to expect in the future.

External tables in Hive are used to access and query data stored outside of a database. Follow the steps of this tutorial to learn how to create, query and drop external tables.