Jack Wallen introduces you to Linux environment variables. What are they and how are they set and unset? How many times have you installed something on Linux, only to find out that you need to set ...

If you're working in a Linux environment, chances are you've encountered environment variables—even if you didn’t realize it at the time. They quietly power much of what goes on behind the scenes in ...

Jack Wallen shows you how to pass environment variables to Docker containers for a more efficient development process. Did you know you can pass environment variables from your host to Docker ...

Variables often look like $var, but they also look like $1, $*, $? and $$. Let's take a look at what all these $ values can tell you. A lot of important values are ...

This blog covers topics across the spectrum of security, privacy and compliance, as well as the people and issues driving enterprise infosec today. Outside of command line tutorials for Linux, the ...

The configuration of your user account on a Linux system simplifies your use of the system in a multitude of ways. You can run commands without knowing where they’re located. You can reuse previously ...

Docker is synonymous with containerized applications and image files, so it's easy to forget that the company that developed the technology has built a complete container application environment and ...

I've added some environment variables to /etc/profile and /etc/bashrc, but when I run commands with sudo, they're not there—sudo env does not list them. Is there some other profile I should be editing ...

Your editor, who is normally not overly worried about operating-system upgrades, approached the Fedora 25 transition on his laptop with a fair amount of trepidation ...