Shell summary

Here, the entire Shell programming series is coming to an end, as a summary, focusing on the main contents of each section, and summarizing some common frameworks and related considerations for Shell programming.

A review of the Shell programming paradigm

TODO: A major review of the sections.

Common Shell Programming "Framework"

TODO: Summarize solutions to common problems by analyzing examples, such as how to ensure that each program has only one running entity (process) at a time.

Program optimization techniques

TODO: Think more and there's always a cleaner and more efficient way.

Other considerations

TODO: For example, be rm -rf how to view system help, etc.