The eval command allows you to run the contents of variables as commands and can be very useful -- especially in scripts.

In a previous column, I showed how to do substring expansion with shell variables in the form of $ {var:start:length}, but it's also useful to know the length of a variable's value. This can be done ...

Another special variable that you might have encountered is the status variable, $?. In a script, this contains the return value of the most recently executed (external) command. This is where you ...

I'm storing sensitive info like the auth token in environment variables. The problem is, the python script can only see them when I run the script manually from the shell (so I know that the code ...

Jack Wallen shows you how to pass environment variables to Docker containers for a more efficient development process.

Adding a Global Path in CentOS Linux. The "path" environment variable in Linux specifies the directories the terminal looks in when you type the path to a command. For example, when you type ...

Why switch to Linux? More security, more privacy, and freedom from vendor lock-in. And these distributions are as simple to install and use as MacOS or Windows.

A critical remote code execution vulnerability in Bash, present in almost all Linux, UNIX and Mac OS X deployments, has been discovered. Experts advise immediate patching.

Bug in Bash shell creates big security hole on anything with *nix in it [Updated] Could allow attackers to execute code on Linux, Unix, and Mac OS X.