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Install Git Bash Completion on Mac OS X

Bash completion for Git isn't available by default on the Mac's Terminal. So you have to assign it yourself in the environment path setup. By default your git directory should be at /usr/local/git in Mac.

Assuming you're at your user directory:

Step 1:
sudo nano .bash_profile

Step 2:
add the line 

source /usr/local/git/contrib/completion/git-completion.bash

Ctrl+X to save, Ctrl+Y to save file name.

Step 3:
source .bash_profile

Logout and Login again.

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