How to encrypt a shell script

Suppose you have written a bash shell script and you want to protect the content of the shell script while sharing it with others. For example, for whatever reason you don’t want the shell script to be viewed for inspection and modified for re-distribution by others. Better yet, you want to set the expiration date on the script, so that the script may not be used beyond the set expiration date. This tutorial describes how you can encrypt your shell script on Linux.