How to commit and push all changes, including deletes?

Question

How to commit and push all changes, including additions, editions, and file deletions etc in one command?

Answer 1

As I understand your question you are asking about "-u" option used as below which will add all already existing in repo entries (but no new ones):

git add -u

which accordingly to man pages:

   -u, --update
       Update the index just where it already has an entry matching . This removes as well as modifies index entries to match the working tree, but adds no new files.
       If no  is given when -u option is used, all tracked files in the entire working tree are updated (old versions of Git used to limit the update to the current directory and its subdirectories).