One git command for:

git add .
git commit -m 'update'

You can use the -a flag to combine add and commit in one command:

git commit -am 'update'

The -a flag automatically stages all modified and deleted files before committing.

Important note: This only works for files that are already tracked by Git. It won't add new/untracked files. If you need to include new files, you'll still need to run git add . first, or you can create a Git alias.

Creating a Git alias for the full workflow

If you want a single command that truly does git add . && git commit -m 'update', create an alias:

git config --global alias.ac '!git add . && git commit -m'

Then use it like:

git ac 'update'

Or for a fixed message:

git config --global alias.update '!git add . && git commit -m "update"'

Then just run:

git update

The ! prefix allows you to run shell commands within Git aliases.