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 ...

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

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 ...

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 ...

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 ...

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 ...

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… ...