It's a simple fact that if you're using a UNIX-like system you'll be using shells sooner or later. These shells run shell script(usually bash). In some systems

It's a simple fact that if you're using a UNIX-like system you'll be using shells sooner or later. These shells run shell script(usually bash). In some systems like Debian(and derivatives) shell scripts are all over your system so any time something breaks or you want something added/disabled/deleted you'll probably be dealing with a shell script or something that is being read by one. So might as well spend the 1-2 hours required to learn how it works and then learn the rest on as-needed basis.