CheckDouble 1.0 by Christian Stieber

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   Copyright (C) 1994 Christian Stieber
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

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CheckDouble will first read all directories that are in the current path,
storing the entries that match the following conditions:
   - the entry doesn't match #?.info
   - the entry is a file or a hard link to a file
   - the entry is not a soft link or a directory
   - the file is readable and executable
   - the file is at least 16 bytes long

Then it checks for the following:

1) Duplicate command names

This means that the programs checks whether there are two commands with
the same name in your path. If it finds such a command name, it will
output a list of the files found:

> Duplicate commandname "MakeLink":
>    Work:System/c/MakeLink
>    System3.1:c/MakeLink

The first file in the list gets executed when the command name is entered;
in the example above I installed a new MakeLink command to override the
one supplied by Commodore.

2) Identical files

All files are compared with each other, and identical files are reported.
For example, if you unpack the gcc256 distribution from aminet, CheckDouble
will report (among other things):

> Identical files:
>    Work:gcc/bin/grep
>    Work:gcc/bin/egrep
>    Work:gcc/bin/fgrep

egrep and fgrep should be links to grep, but lha happily archives the
files three times --- it doesn't know about links.

CheckDouble will ignore links while comparing files.

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Christian Stieber
Konradstraße 41
D-85055 Ingolstadt
(Germany)

Currently (Feb '94) I'm a student and can be reached at:
Christian Stieber
Seitzstraße 6, Zi. 306
D-81539 München
(Germany)

EMail: stieber@informatik.tu-muenchen.de
HTTP:  http://www.informatik.tu-muenchen.de/~stieber/