You can try the command, svnmucc. It can do exactly you want. The link is http://svnbook.red-bean.com/en/1.8/svn.ref.svnmucc.re.html .
according to the link above, the usage is:
propset NAME VALUE URL
Set the value of the property NAME on the target URL to VALUE.
propsetf NAME FILE URL
Set the value of the property NAME on the target URL to the contents of the file FILE.