Since 4414d5c888 (in fish 3.0.0) we
don't autoload completions if the command doesn't exist.
So there is no need to check inside the scripts anymore.
Whats more, a few (like pip and cabal) checked `command -q` instead of
`type -q`, meaning they'd fail if someone used a function instead of a
command of that name.
If the *command* actually needs to exist, checks like that are still
warranted, like in `npm` where aliasing it to `nvm` is popular.
A teensy additional bit: Make `sysctl -w` the same as `sysctl
--write`. That description was bogus.
The last commit to this auto completion changed it to use `string replace` instead of `tr`. Unfortunately they do not behave the same. `tr " = " "\t"` replaces " = " with a tabulator character, while `string replace -a " = " "\t"` replaces it with \t. Either `string` is misbehaving or this auto completion was broken.
