When there is something I might need later, I write it here so I don't
forget. Or when I think about something that could be useful to other people.
Editing svn commit messages
With N being the commit number, and URL the URL of the repository :
$ svn propedit svn:log --revprop -r N URL
$ svn propset svn:log --revprop -r N "new log message" URL