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lab 13 Tagging versions


Let’s call the current version of the hello program version 1 (v1).

Tagging version 1


git tag v1

Now you can refer to the current version of the program as v1.

Tagging Previous Versions

Let’s tag the version immediately prior to the current version v1-beta. First we need to checkout the previous version. Rather than look up the hash, we will use the ^ notation to indicate “the parent of v1”.

If the v1^ notation gives you any trouble, you can also try v1~1, which will reference the same version. This notation means “the first ancestor of v1”.


git checkout v1^
cat hello.rb


$ git checkout v1^
Note: checking out 'v1^'.

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 dc1d42f... Added a default value
$ cat hello.rb
name = ARGV.first || "World"

puts "Hello, #{name}!"

See, this is the version with the default value before we added the comment. Let’s make this v1-beta.


git tag v1-beta

Checking Out by Tag Name

Now try going back and forth between the two tagged versions.


git checkout v1
git checkout v1-beta


$ git checkout v1
Previous HEAD position was dc1d42f... Added a default value
HEAD is now at 4d578d4... Added a comment
$ git checkout v1-beta
Previous HEAD position was 4d578d4... Added a comment
HEAD is now at dc1d42f... Added a default value

Viewing Tags using the tag command

You can see what tags are available using the git tag command.


git tag


$ git tag

Viewing Tags in the Logs

You can also check for tags in the log.


git hist master --all


$ git hist master --all
* 4d578d4 2019-11-01 | Added a comment (tag: v1, master) [Jim Weirich]
* dc1d42f 2019-11-01 | Added a default value (HEAD, tag: v1-beta) [Jim Weirich]
* 9a1c494 2019-11-01 | Using ARGV [Jim Weirich]
* 063b40e 2019-11-01 | First Commit [Jim Weirich]

You can see both tags (v1 and v1-beta) listed in the log output, along with the branch name (master). Also HEAD shows you the currently checked out commit (which is v1-beta at the moment).