[sirclueless]

The point isn't executables that happen to be written in {ba,}sh, it's wrappers that attempt to add functionality to your commandline. For example, Python's virtualenv and Ruby's rvm presumably don't work.

[ash]

I agree with your point. But virtualenv has support for fish:

    . your_env/bin/activate.fish

https://github.com/pypa/virtualenv/blob/develop/virtualenv_e...

[aerique]

Ah, I didn't think of that (no experience with neither virtualenv nor rvm). So thanks for the clarification.