Squash multiple commits into one

commit.md

let's suppose there are 4 commits on top of the latest master that we want to squash

commit 1
commit 2
commit 3
commit 4
origin/master, origin/HEAD, master

1. rebase on master with SHA

git rebase -i [SHA]

2. ^^ command will open up a text editor with every commit starting with the keyword pick apart from the top most commit, change every commit's pick to squash

close the editor

3. ^^ this will open an text editor with commit messages from every commit. Either you can leave the file as is or remove every commit and type a single commit

4. close the editor and you have successfully squashed all 4 commits

If one wants to squash middle commits then

pick commit 1
squash commit 2
squash commit 3
pick commit 4

this will squash 2 and 3 into 1

git reset --soft HEAD~1
git diff --staged > patch