Conversation

```
yutarot@mbp001 ~/.c/fish> head -1 ~/.config/fish/config.fish
set -g fish_user_paths /usr/local/bin /usr/local/opt/gnu-sed/libexec/gnubin $fish_user_paths
yutarot@mbp001 ~/.c/fish> exec fish
Welcome to fish, the friendly interactive shell
yutarot@mbp001 ~/.c/fish> which sed
/usr/local/opt/gnu-sed/libexec/gnubin/sed
```