Fish Shell 4 is written in Rust [LWN.net]

Fish Shell 4 is written in Rust

Posted Feb 15, 2025 6:25 UTC (Sat) by marcH (subscriber, #57642)
In reply to: Fish Shell 4 is written in Rust by intgr
Parent article: Rewriting essential Linux packages in Rust

Many quick and dirty scripts start from my command line history. Conversely, I often copy/paste and "import" functions or other code from scripts to my command line for interactively using and/or testing it. This sort of interactive back and forth is too convenient, productive and important and I really don't want to lose it. So, "fish" is out.

Is zsh "compatible enough" with POSIX? Does not have to be 100% for the above. If not, is there some other, fancy new shell that is significantly better than bash and that I should try? I'd like not to lose too much readline "compatibility" either. readline key strokes are close to universal so why should I learn new, different ones? Except for new features of course. It's painful enough to switch between readline and vi commands already.

Fish Shell 4 is written in Rust

Posted Feb 17, 2025 13:50 UTC (Mon) by taladar (subscriber, #68407) [Link]

zsh can run pretty much any POSIX command unaltered but there are definitely some of the more advanced features in zsh interactive use you couldn't just copy into a bash script without modification (a lot of the globbing stuff comes to mind).

There are also some subtleties that make it unwise to test if a command in a bash script behaves exactly as desired in zsh instead of bash, particularly around sub shells and undefined variables.