radutmped - radutmp editor

radutmped is a utility that can remove utmp entries from radutmp files of several RADIUS servers. It directly manipulates the radutmp file and does not use radzap or any other programs. FreeRADIUS, Cistron Radius Server and GNU Radius radutmp formats are supported. Three search modes are available, radutmped can match entries in radutmp by login (User-Name), nas_port (NAS-Port) or session_id (Acct-Session-Id).

Download source:
radutmped v0.2: radutmped-0.2.tar.bz2 - README

radutmped is licensed for use under GNU GPL v3 and is Copyright (C) 2005, 2006, 2007 Predrag Malicevic.