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@hellomiakoda I have an article on my blog about how to do batch file renaming. If you have a suggestion for me of a specific task (or a class of related tasks) you would like to learn, I’d be happy to write a blog article on how to do it.

To “learn the terminal” means to study the Bourne Shell programming language, so you learn it the same way you learn any other programming language. This comes down to understanding how the lexer and parser works, then the semantics for things like how to assign and use variables, how to construct procedures, and how to do conditional branch execution. Then you learn the “standard libraries,” which for the Linux terminal means learning how to use commands such as find, grep, sed, awk, and so on.

Do you understand how the shell does lexing, that is, breaking up a command into tokens? For example, the command:

Is broken down into the following tokens:

1. echo
2. *
3. |
4. grep
5. '.txt$'
6. >
7. text-files.csv
8. 2>
9. &1
10. &

If you already know that much, you are ready to start learning about conditionals and control flow.