I am working on a collaborative project, and I would like to know who I am logged in as. Am I logged in as myself or someone else? If I check in my work, what username will be associated with the commit?

I am never prompted for a username or password. When I commit changes, they just get committed under someone else's name. I would like them to be committed under my name.

I tried the "--username" option as described on this page, but it didn't seem to work. I did a commit and it was done under the other user's name. I would like some way of knowing for sure that my changes will be committed under my name before I do the commit.