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Welcome to ask.fedora. I've not heard of that shell before, but a little searching found this Documentation on setting environment variables when you log in. Your configuration file is ~/.config/fish/config.fish and unlike most shells, you don't have to export your new path after setting it. (Note that there's an example of modifying the PATH variable included.) I don't know what that set command actually does, but in bash, at least there isn't an option of U. My suggestion is to copy the example of setting the PATH, changing it to add what you need and try again. In either case, please come back and let us know how things work out.