git squash last two commits into one

squash-commits.sh

git rebase --interactive HEAD~2

#  we are going to squash c into b 
pick b76d157 b
pick a931ac7 c

# squash c into b
pick b76d157 b
s a931ac7 c

# after that just edit the commit message

# This is a combination of 2 commits.
# The first commit's message is:

b

# This is the 2nd commit message:

c

Merge the last 3 commits

git reset --soft HEAD~2 # notice this is 2, not 3
git commit --amend

From:

commit 1
commit 2
commit 3

to:

commit 1 # this will include commit 2 and commit 3

Non-interactively

git reset --soft HEAD~2
git commit --amend -C HEAD # this will automatically pick `commit 1` as the commit name

Config

I have this in my git config:

	fixup = "!f(){ git reset --soft HEAD~${1} && git commit --amend -C HEAD; };f"

And I use it as

git fixup 2 # merges the last 2 commits into their parent

Great gist. FYI for convenience you can make the parameter of the fixup git alias optional and set it to a default value of 1 by replacing ${1} with ${1-1}, e.g.:
fixup = "!f(){ git reset --soft HEAD~${1-1} && git commit --amend -C HEAD; };f"

So then you can just do:
git fixup # merges the last commit into its parent

Thank you! this comments are golden!