How to tell what is binding a port?

[Brian Servis <servis@purdue.edu>]

Something is binding to port 139 which is what samba is trying to use
and thus smbd is failing to start.  How can I track down what is bound
to the port?  /etc/services points to netbios-ssn service which is what 
smbd handles but I am getting the following errors in the smb logs:

[1999/10/13 11:39:42, 0] lib/util_sock.c:open_socket_in(671)
  bind failed on port 139 socket_addr=0.0.0.0 (Address already in use)

Thanks for any pointers,

-- 
Brian Servis
-- 
------------------------------------------------------------------------
Mechanical Engineering              |  Never criticize anybody until you  
Purdue University                   |  have walked a mile in their shoes,
servis@purdue.edu                   |  because by that time you will be a
http://www.ecn.purdue.edu/~servis   |  mile away and have their shoes.