git -a "will add and commit" is not correct: -a means "--all"

sanderhollaar · April 2

-a actually means --all and is used instead of providing the name(s) of the file(s) that is to be committed.

-a
--all
    Automatically stage files that have been modified and deleted

Without -a the commit would be performed with commit -m "updated README" README.md

luisviveropena · April 7

I checked on the documentation and you are right. '-a' parameter means the following:

"Automatically stage files that have been modified and deleted, but new files you have not told Git about are not affected".

Per the documentation here:

And then '-m' is the associated message to the commit operation.

Regards,
Luis.

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