Fish as default shell

[funnicus]

To change your login shell to fish:

Add the shell to /etc/shells with:

command -v fish | sudo tee -a /etc/shells

Change your default shell with:

chsh -s "$(command -v fish)"

To change it back to another shell, substitute fish with bash, tcsh or zsh as appropriate in the above command.

[funnicus]

Better would be to add it as default to alacritty and iTerm2 as changing system default shell can be problematic.