How can I reset or revert a file to a specific revision?
I have made some changes to a file which has been committed a few times as part of a group of files, but now want to reset/revert the changes on it back to a previous version.
I have done a
git log along with a
git diff to find the revision I need, but just have no idea how to get the file back to its former state in the past.
Assuming the hash of the commit you want is
git checkout c5f567 -- file1/to/restore file2/to/restore
The git checkout man page gives more information.
If you want to revert to the commit before
~1 (where 1 is the number of commits you want to go back, it can be anything):
git checkout c5f567~1 -- file1/to/restore file2/to/restore
As a side note, I've always been uncomfortable with this command because it's used for both ordinary things (changing between branches) and unusual, destructive things (discarding changes in the working directory).
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You can quickly review the changes made to a file using the diff command:
git diff <commit hash> <filename>
Then to revert a specific file to that commit use the reset command:
git reset <commit hash> <filename>
You may need to use the
--hard option if you have local modifications.
A good workflow for managaging waypoints is to use tags to cleanly mark points in your timeline. I can't quite understand your last sentence but what you may want is diverge a branch from a previous point in time. To do this, use the handy checkout command:
git checkout <commit hash> git checkout -b <new branch name>
You can then rebase that against your mainline when you are ready to merge those changes:
git checkout <my branch> git rebase master git checkout master git merge <my branch>
You can use any reference to a git commit, including the SHA-1 if that's most convenient. The point is that the command looks like this:
git checkout [commit-ref] -- [filename]
git checkout -- foo
That will reset
foo to HEAD. You can also:
git checkout HEAD^ foo
for one revision back, etc.
And to revert to last committed version, which is most frequently needed, you can use this simpler command.
git checkout HEAD file/to/restore
I had the same issue just now and I found this answer easiest to understand (
commit-ref is the SHA value of the change in the log you want to go back to):
git checkout [commit-ref] [filename]
This will put that old version in your working directory and from there you can commit it if you want.