svn propedit — Edit the property of one or more items under version control.
Edit one or more properties using your favorite editor. The first form edits versioned properties in your working copy, while the second edits unversioned remote properties on a repository revision.
--revision (-r) REV --revprop --username USER --password PASS --no-auth-cache --non-interactive --encoding ENC --editor-cmd EDITOR --config-dir DIR
svn propedit makes it easy to modify properties that have multiple values:
$ svn propedit svn:keywords foo.c <svn will launch your favorite editor here, with a buffer open containing the current contents of the svn:keywords property. You can add multiple values to a property easily here by entering one value per line.> Set new value for property 'svn:keywords' on 'foo.c'