Newbie question: commit

[lluporini]

    I'm trying to get my development project in php/javascript into cvs.

    My project has this directory structure:

    /
    somefile.html
    otherfile.php
    /modules
       files.*
    /doc
       files.*
    /someotherdir
       otherfiles.*
    /config
          custom_config.php

    The problem i'm facing is that custom_config.php file contains generic
config values that needs to be modified by every developer/user to get the
software working, but I don't want that nobody updates the repository with a
custom user/passwd pair, for example, inside custom_config.php when doing a
commit. So I suppose that if any developer that issues a commit, tries to go
through it on a file by file basis, everything would go ok but what about a
commit with cvs recursive behavior?
    My question is: is there a way to prevent a file/directory from being
commited when someone does a "project wide" commit?

    Thanks in advance.

Luis.

PD: Sorry about my poor english

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