How do pre- and post-session shell commands function?

Question

Q:

 How do pre- and post-session shell commands function?

Answer 1

A command task can be called as a pre- or post-session shell command for a session task. Users can run it as a pre-session command, a post-session success command, or a post-session failure command. Based on use cases, the application of shell commands can be changed or altered.