Simply put, a Shell Script is a program that is run by a UNIX/Linux shell. It is a file that contains a series of commands which are executed sequentially as if they were entered on the command line ...

Everything needed to use the same script with Linux and all varieties of UNIX is present: Linux, Solaris, AIX and HP-UX have one subsection each. The first chapter is a quick tutorial of shell ...

Many Linux-based machines run Bash as their standard scripting engine, but some distributions, like Alpine and Debian, don't. Testing your script with other shells can help with portability.

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 ...