[Git 常見問題] How to undo a git merge with conflicts

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Question
I am on branch mybranch1. mybranch2 is forked from mybranch1 and changes were made in mybranch2.

Then, while on mybranch1, I have done git merge --no-commit mybranch2 It shows there were conflicts while merging.

Now I want do discard everything (the merge command) so that mybranch1 is back to what it was before. I have no idea how do I go about this.

HowTo
Latest Git:

# git merge --abort

This attempts to reset your working copy to whatever state it was in before the merge. That means that it should restore any uncommitted changes from before the merge, although it cannot always do so reliably. Generally you shouldn't merge with uncommitted changes anyway.

Prior to version 1.7.4:

# git reset --merge

This is older syntax but does the same as the above.

Prior to version 1.6.2:

# git reset --hard

which removes all uncommitted changes, including the uncommitted merge. Sometimes this behaviour is useful even in newer versions of Git that support the above commands.