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Date: Fri, 10 Apr 92 11:28:46 -0700
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From: acheng@ncsa.uiuc.edu (A. Cheng)
Subject: Re: temp-XXXXX files
To: postgres@postgres.berkeley.edu
Sender: pg_adm@postgres.berkeley.edu

> Also many ".nfsXXXX" files are generated and left there.

Those are from NFS.  The following is the "BUGS" section of the
man page NFS(4):

BUGS
     When a file that is opened by a client is unlinked  (by  the
     server),  a  file with a name of the form .nfsXXX (where XXX
     is a number) is created by the client.  When the  open  file
     is  closed,  the  .nfsXXX  file  is  removed.  If the client
     crashes before the file can be closed, the .nfsXXX  file  is
     not removed.