Oh happy day! I got an e-mail from a reader with a shell script question that didn't appear to be homework from a programming class or anything to do with hacking passwords. The reader wrote: I am ...

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 ...

ITworld.com – Some of the worst-written scripts that I have encountered perform some action on behalf of the person running the script and then blithely continue on without ever checking whether the ...

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. Whenever you run a command in a ...