07-18-2012
One approach could be a script, that runs as a demon in the background and compares a list of files with their unmodified status (cksum?) and checks if anything changes. Has to run as root and makes no sense if the other users are also using the root account of course.
The list also needs to be updated in case there is any legal change to the files in a way, that daemon running in the background knows it is a legal change.
This would also only work when the file is already written.
To notice when any of the files in that directory are opened for a write might be more tricky and not be to handle by a shell script.
In your case I would use one of the already existing softwares or auditing.
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LEARN ABOUT LINUX
service
service(8) System Manager's Manual service(8)
NAME
service - run a System V init script
SYNOPSIS
service SCRIPT COMMAND [OPTIONS]
service --status-all
service --help | -h | --version
DESCRIPTION
service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
directory set to /.
The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the
invoked script, service passes COMMAND and OPTIONS it to the init script unmodified. All scripts should support at least the start and
stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start
command.
service --status-all runs all init scripts, in alphabetical order, with the status command.
EXIT CODES
service calls the init script and returns the status returned by it.
FILES
/etc/init.d
The directory containing System V init scripts.
ENVIRONMENT
LANG, TERM
The only environment variables passed to the init scripts.
SEE ALSO
/etc/init.d/skeleton,
update-rc.d(8),
init(8),
invoke-rc.d(8).
Jan 2006 service(8)