How to Install and Configure Fish Shell in Ubuntu?

Fish Shell is a unique user-friendly command-line shell for the different operating systems. fish includes some smart features like syntax highlighting, fancy tab completions and autosuggest-as-we-type that just works by default with no configuration required. fish is mostly written in shell script and in C++.

Step 1: Install fish repository in ubuntu

$ sudo apt-add-repository ppa:fish-shell/release-3 

Step 2: Update and upgrade repository

$ sudo apt-get update && sudo apt-get upgrade

Step 3: Install fish shell

$ sudo apt-get install fish

Step 4: Make fish shell as default shell

$ sudo chsh -s /usr/local/bin/fish

To get back to bash, use

$ sudo chsh -s 'which bash'

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