chipzz@dev560:~/myproject (timeout_cleanup)$ git rev-parse HEAD
7a3c183f55e4eed31c0a1d4a819e4dc75f9abde0
chipzz@dev560:~/myproject (timeout_cleanup)$ git checkout master
Switched to branch 'master'
chipzz@dev560:~/myproject (master)$ git checkout 7a3c183f55e4eed31c0a1d4a819e4dc75f9abde0
Note: checking out '7a3c183f55e4eed31c0a1d4a819e4dc75f9abde0'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b new_branch_name

HEAD is now at 7a3c183... CommitMessage
chipzz@dev560:~/myproject ((7a3c183...))$ git log | head -n1
7a3c183f55e4eed31c0a1d4a819e4dc75f9abde0 (HEAD, timeout_cleanup) CommitMessage
chipzz@dev560:~/myproject ((7a3c183...))$ git rev-parse --symbolic
chipzz@dev560:~/myproject ((7a3c183...))$ git checkout timeout_cleanup
Switched to branch 'timeout_cleanup'
chipzz@dev560:~/myproject (timeout_cleanup)$ git log | head -n1
7a3c183f55e4eed31c0a1d4a819e4dc75f9abde0 (HEAD, timeout_cleanup) CommitMessage