$ svn commit -m "changed something"resulting in revision 989, and discovered it didn't work. D'oh!
To undo this commit, and go back to the state of the code in revision 988:
$ svn update
$ svn merge -c -989 https://svn.myserver.org/svn/myproject
$ svn stat
$ svn commit -m "undid the previous change"This results in revision 990, but with the state of the code as in 988.