Install fish shell in ubuntu

run command:

bash

sudo apt-add-repository ppa:fish-shell/release-3
sudo apt-get update
sudo apt-get install fish

set fish as default shell

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chsh -s /usr/bin/fish
or
chsh -s $(which fish)

install oh my fish
https://github.com/oh-my-fish/oh-my-fish

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curl -L https://get.oh-my.fish | fish

set agnoster theme

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omf theme agnoster

add newline agnoster