chkwtmp - check wtmp-file for overwritten information

   Copyright (c) DFN-CERT, Univ. of Hamburg 1994

   Univ. Hamburg, Dept. of Computer Science
   DFN-CERT
   Vogt-Koelln-Strasse 30
   22527 Hamburg
   Germany



   This program is free software; you can distribute it and/or modify
   it as long as you retain the DFN-CERT copyright statement.

   It can be obtained via anonymous FTP from 
   ftp.informatik.uni-hamburg.de:/pub/security/dfncert/fixes/chkwtmp.tar.Z

   This program is distributed WITHOUT ANY WARRANTY; without the IMPLIED
   WARRANTY of merchantability or fitness for a particular purpose.

   This package contains:
       README
       MANIFEST
       chkwtmp.1
       chkwtmp.c
       chkwtmp.txt

   To create chkwtmp under SunOS 4.x, type:
   % cc -o chkwtmp chkwtmp.c 

   To run chkwtmp you need read permission on the file /var/adm/wtmp.
   Normally this file is world-readable and no special privileges are 
   required to run the checker. 

   The following is an example of the output of chkwtmp.

   Running chkwtmp on a machine with deleted wtmp-entries, under csh(1):

   % chkwtmp
   1 deletion(s) between Thu Sep 29 08:23:57 1994 and Thu Sep 29 14:11:58 1994
   % 

   Running chkwtmp on a machine with no deleted wtmp-entries, under csh(1):

   % chkwtmp
   %