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Download the file git-completion.bash from Github.

Add this line to your bash profile (e.g. .bashrc), I assume you have copied git-completion.bash at the root of your home folder.

source ~/git-completion.bash

If .bashrc doesn’t exist, create it first.

This line will load git-completion.bash automatically when you open a bash session.

You will then be able to autocomplete all your Git commands (using Tab), and also access advanced completion e.g. look for local and remote branches by starting typing the name.