<1> This is most often done when you remembered what you
just committed is incomplete, or you misspelled your commit
message, or both. Leaves working tree as it was before "reset".
-<2> make corrections to working tree files.
+<2> Make corrections to working tree files.
<3> "reset" copies the old head to .git/ORIG_HEAD; redo the
commit by starting with its log message. If you do not need to
edit the message further, you can give -C option instead.
++
+See also the --amend option to gitlink:git-commit[1].
Undo commits permanently::
+
<2> Rewind the master branch to get rid of those three commits.
<3> Switch to "topic/wip" branch and keep working.
-Undo update-index::
+Undo add::
+
------------
$ edit <1>
-$ git-update-index frotz.c filfre.c
+$ git add frotz.c filfre.c
$ mailx <2>
$ git reset <3>
$ git pull git://info.example.com/ nitfol <4>
------------
+
-<1> you are happily working on something, and find the changes
+<1> You are happily working on something, and find the changes
in these files are in good order. You do not want to see them
when you run "git diff", because you plan to work on other files
and changes with these files are distracting.
-<2> somebody asks you to pull, and the changes sounds worthy of merging.
-<3> however, you already dirtied the index (i.e. your index does
+<2> Somebody asks you to pull, and the changes sounds worthy of merging.
+<3> However, you already dirtied the index (i.e. your index does
not match the HEAD commit). But you know the pull you are going
to make does not affect frotz.c nor filfre.c, so you revert the
index changes for these two files. Your changes in working tree
remain there.
-<4> then you can pull and merge, leaving frotz.c and filfre.c
+<4> Then you can pull and merge, leaving frotz.c and filfre.c
changes still in the working tree.
Undo a merge or pull::
+
------------
$ git pull <1>
-Trying really trivial in-index merge...
-fatal: Merge requires file-level merging
-Nope.
-...
Auto-merging nitfol
CONFLICT (content): Merge conflict in nitfol
Automatic merge failed/prevented; fix up by hand
$ git reset --hard ORIG_HEAD <4>
------------
+
-<1> try to update from the upstream resulted in a lot of
+<1> Try to update from the upstream resulted in a lot of
conflicts; you were not ready to spend a lot of time merging
right now, so you decide to do that later.
<2> "pull" has not made merge commit, so "git reset --hard"
which is a synonym for "git reset --hard HEAD" clears the mess
from the index file and the working tree.
-<3> merge a topic branch into the current branch, which resulted
+<3> Merge a topic branch into the current branch, which resulted
in a fast forward.
-<4> but you decided that the topic branch is not ready for public
+<4> But you decided that the topic branch is not ready for public
consumption yet. "pull" or "merge" always leaves the original
tip of the current branch in ORIG_HEAD, so resetting hard to it
brings your index file and the working tree back to that state,