Reddit reviews Ed Mastery: The Standard Unix Text Editor (IT Mastery Book 13)
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On the same subject, I will give you another very valuable piece of advice, which (almost) no one else will.
When you write shell scripts, you will need a text editor; and while it might not be the only editor you use, I would strongly recommend that you learn to use Ed. There is a book for learning it on Amazon, which is extremely easy to follow, and which offers exercises that cover the basics, after which you will be able to keep using it yourself.
Ed is a tiny, insignificant program, which is viewed with contempt by most of those who still know about it, and isn't even still included as part of a default install on most distributions; yet if you learn to use it, Bash, and the other text utilities which are incorporated into Bash scripts, you will be able to perform tasks for which most other people need much more complex programming languages. Mentally, I honestly compare Ed with a light saber.
https://www.youtube.com/watch?v=HcZ9kQ1h-ZY