What is Git?

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Git is a version-control system for tracking changes in computer files and coordinating work on those files among multiple people. It is primarily used for source-code management in software development, but it can be used to keep track of changes in any set of files.
how to setup git on ubuntu ppa
just run this below mentioned three command one by one:
$ sudo apt-add-repository ppa:git-core/ppa
$ sudo apt-get update
$ sudo apt-get install git
after run above mentioned three command run below command
$ git --version

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