> From: Roy Vardi <roy.va...@gmail.com>
> 
> How do I switch to a hash on a branch without creating\moving to a new 
> branch?
> Say I'm currently at the HEAD of master, and its hash is aaa.
> I want to stay on master, only switch to a previous hash... (say eee...)
> I know I can use the HEAD~<#> or whatever, but I'd like to find out how to 
> do it based only on a hash...

It depends on exactly what you want to do.

If you want to set the files in your working directory to be the state
of a particular hash, you can do "git checkout <hash>".

However, there is the matter of Git's record of "what is currently
checked out".  Normally, "what is currently checked out" (which is
stored in .git/HEAD) is (for example), "master".  (Actually, "ref:
refs/heads/master".)  That makes it possible to add a new commit to
the repository whose parent is the former value of "master", and
update "master" to be the new commit.

When you checkout a particular hash, you are in a state called
"detached head", in which "what is currently checked out" is just the
hash, and creating a new commit does not update any branch.  (IIRC,
you have to provide a special option to git-commit to actually create
the commit, as normally one doesn't want to do that.)

Dale

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