How to search through commit history using either of:

• git log
• git grep

Examples use the Git repository for the “Pro Git” book found here.

The git log command supports looking for commits by the content of their commit messages, or even the content of the diff they introduced. All examples here can be enhanced with the regular git log options.

$ git log --author="Robert P. J. Day"
$ git log --author="Robert P\. J\. Day"
$ git log --author="P\. J\."
$ git log --author="Robert P. J. Day" --oneline
$ git log -i --author="robert p. j. day"

--since=<date>, --after=<date>
    Show commits more recent than a specific date.

--until=<date>, --before=<date>
    Show commits older than a specific date.

So:

$ git log --since="Feb 1, 2019"
$ git log --author="Ben Straub" --since="Jan 1, 2019" --until="Feb 1, 2019"