etc VS pure-bash-bible

Since this is now a share your prompt thread, here's mine:

https://github.com/rollcat/etc/tree/master/cmd/prompter

It's quite portable (didn't test on Windows though); ~170 lines of Go; no dependencies outside of stdlib; calls no external commands; supports SSH, git, Docker, nix, and virtualenv; extremely simple to hack on.

It's fairly easy to grab info from .git for your own purposes. For example, the program that generates my PS1 peeks there (without wasting precious cycles on shelling out to the git command) to find the current branch we're on:

https://github.com/rollcat/etc/blob/b2fd739/cmd/prompter/mai...

Depends on what you're trying to do. If you're shelling out to git(1) or docker(1), rather than e.g. recursively checking for the presence of .git in parent directories, or inspecting ~/.docker/config.json, then the fork+exec overhead is already quite significant. Next if you're parsing ~/.docker/config.json in shell, you're most likely either asking for trouble or (again) shelling out to jq. Writing it all in an interpreted language means you're paying the cost of interpreter startup, which on underpowered systems can take hundreds of milliseconds even when idle. OTOH loading a static binary to memory happens only once, and with Go you can trivially cross-compile.

I also have a fallback shell one-liner, without any of the fanciness like displaying the current git branch:

https://github.com/rollcat/etc/tree/master/cmd/prompter#i-li...

I believe it's been posted here before, but I also use this for reference whenever I forget the syntax to something, or know there must be a better way than what I am doing.

https://github.com/dylanaraps/pure-bash-bible

I'd say check out the work of William Shotts at https://linuxcommand.org/ His book, "The Linux Command Line" is free for downloading, and there are lots of references to style guides, good practices, and bash templates in the book.

There is also a shorter, HTML version at the same site: https://linuxcommand.org/lc3_learning_the_shell.php

I'm trying to get a little proficiency in all this, and just yesterday I went through the "Further Reading" sections at the end of each chapter, and captured all the likely URLs for further investigation.

One that looks really good is Dylan Araps' "Pure Bash Bible" ( See https://github.com/dylanaraps/pure-bash-bible ) Confession: I found a PDF copy at Libgen, but don't tell anyone. This and the Shotts book have also been thoroughly discussed on Hacker News in the past. (I.e., search on the two titles and you'll probably get all the opinions that you can stand, plus maybe some more hints.)

Bash is profoundly weird, but if/when you can make it work, it's slick.

pure bash bible

I recommend taking a look at https://github.com/dylanaraps/pure-bash-bible

Additionally, Pure Bash Bible is a bit more advanced but really fun to go through it.

Here is another resource I have found useful.

Pure Bash Bible : A collection of pure bash alternatives to external processes.