Unix security suggestion

[Warren Burstein]

In article <8064 at bloom-beacon.MIT.EDU> scs at adam.pika.mit.edu (Steve Summit) writes:
>	::0:0:::
>lines which are, incredibly, still routinely left in the passwd
>file by broken software.

Just what does cause these?  I haven't seen any for a while.
Are there particular programs responsible?  I once had passwd
so full of them that ls -l ran noticably slow.
-- 
/|/-\/-\       The entire world
 |__/__/_/     is a very strange carrot
 |warren@      But the farmer
/ wwd.UUCP     is not worried at all.