If you made several changes in a file, but only want to commit a portion of it,
you can add the
--patch option to the git add command.
git add file --patch
This will interactively walk you through the changes you made and let you specify what to include and what to leave out.
If git presents you with a chunk larger than what you would like to add, you
can use the "
e" interactive command to specify the exact lines that you
want added or removed.