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Full Discussion: Tracking change inside the script
Top Forums Shell Programming and Scripting Tracking change inside the script Post 302715737 by jim mcnamara on Monday 15th of October 2012 10:10:05 AM
Old 10-15-2012
One way of many to do this:

Part A.
create a list of script files with full script files names: e.g., /path/to/script.sh
Next use that list to create a file with checksums
Code:
while read fname 
do
  /usr/bin/cksum $fname
done < /path/to/list.txt > /path/to/checksums.txt

Now you are set up. NOTE: if your detect a change, that means you have to redo the checksums, if the change was okay and you want to keep it as part of the cron jobs.

Part B
create a script to check the files
Code:
#!/bin/ksh
# check.sh
while read fname 
do
  /usr/bin/cksum $fname
done < /path/to/list.txt > /tmp/test.txt
/usr/bin/diff  /tmp/test/test.txt  /path/to/checksums.txt > /dev/null
# diff returns 1 if the files are different - meaning code has changed
if [ $? -eq 1 ] ; then 
   echo 'warning files have changed check /tmp/test.txt' | /usr/bin/mailx -s 'Warning' \
     netdbaind@somecompany.com   
fi
exit 0

Put this entry into cron. Be sure your buddies cannot change/edit your check.sh
Code:
0,5,10,15,20,25,30,35,40,45,50,55 * * * *  /path/to/check.sh

You may be tempted to make it every minute. Don't. One day you will come into work with 190 emails waiting for you.
This User Gave Thanks to jim mcnamara For This Post:
netdbaind
 

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LEARN ABOUT DEBIAN

i-ls

i-ls(1) 						      General Commands Manual							   i-ls(1)

NAME

       i-ls - display file stat and checksum information for files

SYNOPSIS

       i-ls [-s] filename

       i-ls [-s] dirname

       Specify a filename for i-ls to examine, or specify a directory with dirname to examine all the files in the directory.

       -s

	      Do not show/calculate checksums for all regular files.

DESCRIPTION

       The integrit system detects intrusion by detecting when trusted files have been altered.

       integrit records information about files in a database.	i-ls allows the user to see that information for live files.

       The output syntax is the same as that of integrit.

EXAMPLES

	    i-ls /tmp/foo.txt

       shows file stat attributes for the file, "/tmp/foo.txt".

	    i-ls /tmp

       shows file stat attributes for all files in the directory, "/tmp".

	    i-ls -s /tmp

       shows file stat attributes for all files in the directory, "/tmp", also including also checksums for all regular files.

AUTHOR

       Ed L Cashin <ecashin@users.sourceforge.net>

       See the integrit web site for up to date releases and information at

	   http://integrit.sourceforge.net/

SEE ALSO

       Integrit File Verification System Manual (info), lstat(2)

Version 4.1							   Jul 27, 2001 							   i-ls(1)
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