I install the cargo building environment.
I use cargo install exa to install exa (an alternatives of command ls).
Executable file is put in $HOME/.cargo/bin.
I use fish shell set -gx PATH $PATH $HOME/.cargo/bin, and then I can use command exa on current session.
But when I open a new session, I cannot execute exa unless set -gx ... again.
I look in the options gx:
--global -g (Make variable scope global)
--export -x (Export variable to subprocess)
Does not global mean every session? Could someone help me pls?
Doesnot global means every session?
It doesn't. It's "global" as opposed to "local". From the fish documentation:
Global variables are specific to the current fish session, and will never be erased unless explicitly requested by using set -e.
In general, what you want is to just put the set -gx into ~/.config/fish/config.fish. That's fish's configuration file.
Fish also has "universal" variables, which are stored persistently, but they interact awkwardly with exporting so I wouldn't recommend it.
For $PATH specifically, fish offers the fish_user_paths variable that it adds automatically, so you can run
set -U fish_user_paths $fish_user_paths $HOME/.cargo/bin
once, interactively, and fish will take care of it. This is a universal variable, but fish takes care to add it to $PATH when necessary (for each component it checks if it's already there and such). Do not put this into config.fish, or it will add one $HOME/.cargo/bin every time you start a fish, and so it would balloon the variable.
To recap:
set statement into config.fish