git diff <branchname1>..<branchname2>

Show the difference between the contents of two branches

Like with many other git commands, you can replace branchnames with commit hashes to get a diff between the two commits:

git diff <commitA>..<commitB>

You can send the results of the command to a file for later use in a git patch operation, like this:

git diff <branchname1>..<branchname2> > <filepath>
Specific examples:
git diff main..my-feature-branch

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