Each Linux command returns an exit code, with 0 indicating success and non-zero values indicating failure. You can use the $? variable to access the exit code and control program flow in scripts ...

Debugging Your Script With Exit Codes. Exit codes are especially useful when you’re writing shell scripts. They help your script determine whether something went right or wrong, allowing it to decide ...

Please help me understand the following: myscript.sh : #! /bin/sh exit 13 different outcomes : $ if ./myscript.sh ; then echo OK. ; else echo Code $ ...

Knowing how to work with and display exit codes on the Linux command line or in scripts can help make ... I start a second shell inside my current shell by typing “/bin/bash” and then exit it ...

An exit code other than 0 indicates that a script or a command has failed in some way. Learn more about exit codes and the types of errors they represent in this post.

Last month, we looked at signals, the rudimentary mechanism that processes on a Linux box can use to communicate events and state changes. We talked about how each of the signals can be sent manually ...

It is easy to dismiss bash — the typical Linux shell program — as just a command prompt that allows scripting. Bash, however, is a full-blown programming language. I wouldn’t pres… ...

Shell scripts are not compiled — at least, not typically — so the shell only reads what it needs to do the work. That means if your script is careful to exit, you can add as much “garbage ...