Editor's Note: This article has been updated by its author. Thank you, Pat. Have you ever wanted to change the names of many files at once? Or, have you ever needed to use a default value for a ...

Todas las variables en los scripts bash, a menos que se definan de otra manera, son globales, es decir, una vez definidas pueden ser utilizadas en cualquier parte del script. Para que una variable sea ...

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 ...

The venv CLI tool is a versatile utility for managing environment variables in a bash environment. It allows users to install, set, get, delete, and list environment variables across various types, ...

protect a variable name from surrounding characters. $ export foo=foo $ echo ${foo}bar # foo exists so this works as expected foobar $ echo $foobar # foobar doesn't ...

Linux 101: What are environment variables? Your email has been sent Jack Wallen introduces you to Linux environment variables. What are they and how are they set and ...

I am writing a bash script that will accept multiple arguments. My goal is to loop thru all the arguments and display them one by one. If I have a $counter variable and I want to use that counter ...

Bash, aka the Bourne-Again Shell, has a newly discovered security hole. And, for many Unix or Linux Web servers, it's a major problem. The flaw involves how Bash evaluates environment variables. With ...