The only good part of sh/bash script is to run commands with piping/redirection support IMO，other than that I saw posts like this to explain sh/bash script’s puzzles/pitfalls all the time.
zsh is also doing the variable substitution better than bash. FYI, I just released rust_cmd_lib 1.0 recently, which can do variable substitution without any quotes: https://github.com/rust-shell-script/rust_cmd_lib
Thanks Steve. I have studied the "200 lines" book a few days ago, but was still confused. Only after seeing your talks, everything becomes so much clearer. These talks should really be part of the "async book" :)
I have created a similar library for bash. However, there are more pitfalls related to errexit, see [1] and even shellcheck can not help there. I have tried to solve the pitfalls in my library, but it turned out to be ugly and unreliable. That's why I'm trying to use rust [2] for shell scripting like tasks nowadays.
since run_cmd! and run_fun! are returning result type, you can always do let _ = run_cmd!(ls nofile); to ignore single command error.
The “xxx || true” is for ignoring error within a group of commands, which is also very common in sh “set -e” mode. Without it, the group of commands need to be divided into at least 3 parts to still capture all possible command errors. I probably need to document this part with more details.
Thanks, yes since I just finished the core functionality of this project and I am not surprised if it is still missing some critical features when converting bash script. Pls file bugs if you find anything :)
Author here, thanks for your feedback. This library is calling std::process::command underneath without any shell dependency, which I believe is the same as plumbum’s run* APIs and I should make it clearer in the docs.
This plumbum has its own “cp”, “cat” .., which is similar to shelljs and it looks like a lot of people like this idea which can also be supported by this library in the future.
I am recently working on a
hobby programming language: https://github.com/rust-shell-script/rust-shell-script, which could compile to either rust code or shell script. This book helps me clarified a lot of things along the implementation.