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09.06.2005 at 07:21AM PDT, ID: 21551994
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5.2

Cron job to detect file changes

Asked by Brainstormer in Linux Programming

Tags: , , ,

I am looking for a bash script that runs as a daily cron job to do the following:

Test to see if a file was reduced by specific threshold, such as 10Kb and if so, send a list of those files to me via email.

Current situation:

Many DAT and BAKx files in a single folder. A utility checks the DAT files for needed modifications. If modifications are needed, it backups up the file to a BAKx file and modifies it. Sometimes the DAT file gets corrupt in the process, and the file size is shrunk considerably. The structure is as follows:

sample1.dat           1Kb  --- Modified 09-06-05
sample1.dat.bak1   22Kb --- Modified 09-04-05
sample1.dat.bak2   28Kb --- Modified 09-05-05
...
sample1.dat.bak5   24Kb --- Modified 08-30-05
sample1.dat.bak6   23Kb --- Modified 09-06-05

sample1.dat is the currently used file, but is corrupt (1Kb)
sample1.dat.bak6 is the most recent backup of this file as per this example based on the modified/created date, but it can be any of the BAK files

There are only 6 BAK files per DAT file.

I want to be able to detect if the DAT file changes considerably, either by keeping track of the previous size somehow and comparing it with the current or comparing it with the most recent BAKx file.

Note: the utility modifications are usually small 1-5Kb. When the file is corrupt, it shrinks to more than 5Kb, usually 10Kb or more.

Any ideas and scripts are welcome,Start Free Trial
[+][-]09.06.2005 at 07:42AM PDT, ID: 14829437

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[+][-]09.25.2005 at 04:51AM PDT, ID: 14953699

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[+][-]09.26.2005 at 01:40AM PDT, ID: 14957100

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[+][-]09.26.2005 at 08:16AM PDT, ID: 14959414

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About this solution

Zone: Linux Programming
Tags: bash, script, cron, file
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Solution Provided By: da99rmd
Participating Experts: 2
Solution Grade: A
 
 
[+][-]09.26.2005 at 08:46AM PDT, ID: 14959744

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