This section is from the "Version Control with Subversion" book, by Ben Collins-Sussman, Brian W. Fitzpatrick and C. Michael Pilato. Also available from Amazon: Version Control with Subversion.
svnlook author — Print the author.
svnlook author REPOS_PATH
Print the author of a revision or transaction in the repository.
--revision (-r) REV --transaction (-t)
svnlook author is handy, but not very exciting:
$ svnlook author -r 40 /var/svn/repos sally