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1. Read the Git for Computer Scientists introduction (skip this if you are already familiar with Git). 
2. For Linux, Git is available in its own package. Windows users can install msysGit. For MacOS, Git is available as part of Xcode; if you cannot install that, use Git for OSX.

3. Create a local repository for the "Turing Project":

   No Format
   $ mkdir turing $ cd turing $ git init Initialized empty Git repository in ~/turing/.git/

   Panel
   $ mkdir turing $ cd turing $ git init Initialized empty Git repository in ~/turing/.git/

   Code Block
   language bash
   $ mkdir turing $ cd turing $ git init Initialized empty Git repository in ~/turing/.git/

4. Add some content: copy notes.txt to your turing directory.

   No Format
   $ git add notes.txt $ git commit -m "wrote some first notes" [master (root-commit) 2e73b34] wrote some first notes 1 files changed, 5 insertions(+), 0 deletions(-) create mode 100644 notes.txt

5. Edit notes.txt:
   
   1. Replace "fixed" with "infinite" in line 1.
   2. Replace "... (TODO)" with "a finite state machine" in line 4.

6. Commit the modified content to your local repository:

   No Format
   $ git add notes.txt $ git commit -m "modified tape length, found a controller for tape head" [master 3f28a0e] modified tape length, found a controller for tape head 1 files changed, 2 insertions(+), 2 deletions(-)

After the preceding steps you have two commits in your local repository, each with one file in the index. You have different options commands for viewing these commits:

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Note that each commit is identified by a looong hash value, but it is possible to use only a prefix when referencing them (if the prefix is not ambiguous): the example above uses 3f28a0e to identify the second commit. Also try the command gitk to get an overview of your commits (a better alternative available for MacOS is GitX).