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 ...

The printf command offers well-defined behavior following the POSIX standard, which means it works the same way across shells and systems. Where echo often fails with escape sequences, printf handles ...

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 ...

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 ...

Last month, we took a strange turn and actually just focused on the basics of shell scripting, special variable notation, rather than solving some complex and obscure scripting challenge. I'm going to ...