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To add something to $PATH in fish, I use

fish_add_path -a ~/foo/bar

Then fish adds ~/foo/bar to my ~/.config/fish/fish_variables:

SETUVAR fish_user_paths:/Users/john/foo/bar

Then, is it correct to say that to remove /Users/john/foo/bar from $PATH, I have two options:

  • to edit the fish_variables file

  • to use the following function:

    // https://github.com/fish-shell/fish-shell/issues/8604#issuecomment-1169638533
function remove_path
  if set -l index (contains -i "$argv" $fish_user_paths)
    set -e fish_user_paths[$index]
    echo "Removed $argv from the path"
  end
end

And the second part of the question: How to properly use that function? I saved it as remove_from_path.fish, executed as remove_from_path.fish "/Users/john/foo/bar", but it doesn't seem to remove /Users/john/foo/bar from $PATH. What I'm doing wrong?

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I saved it as remove_from_path.fish, executed as remove_from_path.fish "/Users/john/foo/bar"

If you save it as a script file, fish will run that file, define the function, and then not do anything.

You would typically save this as a fish function - either put it in your ~/.config/fish/config.fish, or save it as a standalone file in ~/.config/fish/functions/remove_path.fish (the name must match the function name!), and then run it as just

remove_path /Users/john/foo/bar

without the ".fish". With that, fish knows the function and calls it.

Or, if you want to use the script file, you would call the function inside:

function remove_path
    # code here
end

# Now call the function we just defined:
remove_path $argv

This will start a second fish instance, which will then remove the path. This works because universal variables are shared across all fish instances, but is a bit silly.

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