Git: How to squash all commits on branch

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I make new branch from master with:

git checkout -b testbranch

I make 20 commits into it.

Now I want to squash those 20 commits. I do that with:

git rebase -i HEAD~20

What about if I don’t know how many commits? Is there any way to do something like:

git rebase -i all on this branch

Solution

Another way to squash all your commits is to reset the index to master:

git checkout yourBranch
git reset $(git merge-base master $(git branch --show-current))
git add -A
git commit -m "one commit on yourBranch"

This isn’t perfect as it implies you know from which branch "yourBranch" is coming from.
Note: finding that origin branch isn’t easy/possible with Git (the visual way is often the easiest, as seen here).

Note: git branch --show-current has been introduced with Git 2.22 (Q2 2019).


EDIT: you will need to use git push --force


Karlotcha Hoa adds in the comments:

For the reset, you can do

git reset $(git merge-base master $(git rev-parse --abbrev-ref HEAD)) 

[That] automatically uses the branch you are currently on.
And if you use that, you can also use an alias, as the command doesn’t rely on the branch name.


sschoof adds in the comments:

Since my default branch is called main and my search had multi times brought me here:
To copy it for my next time

git reset $(git merge-base main $(git rev-parse --abbrev-ref HEAD))

Source: StackOverflow.com

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