Network World

Using the eval command in Linux to run variables as commands

The eval command allows you to run the contents of variables as commands and can be very useful, especially in scripts. There are probably a lot of Linux users who have never encountered the eval ...
Network World

Getting started with scripting on Linux: Testing variables

This post follows up on Part 1 by examining the many ways that you can test the value of variables – e.g., whether they equal particular strings like “yes” or “no”, if they have a numeric value, if ...
Linux Journal

Work the Shell - Special Variables I: the Basics

There I was, trying to come up with a topic for this column, when I did what I usually do when stumped: I sent a question out to my Twitter followers. This time, I got a great answer, from John ...
Ars Technica

Python script can't see environment variables on Linux

I have a simple API running in Flask on a Raspberry Pi. The Pi has Debian (buster) installed. In the API, I am making calls to Twilio. I'm storing sensitive info like the auth token in environment ...
Linux Journal

#Variables

One crucial component of the Linux environment is the PATH variable. It's like a guide that directs the system to where it can find the programs you're asking it to run. In this article, we will delve ...