Shell Programming and Scripting

Robin,

If I want to mail the alert condition to a email address what would my code look like....I mean can you replace the Take Some action with some code that would send an alert to an email address with a particular subject. And with current_file=/tmp/current and previous_file=/tmp/previous am I supposed to given a directory path that I want to monitor? I want to do it for all the directory under /home and I am performing this testing with root user.

Thanks

For the e-mail, it depends what you want to send and who to.

The files mentioned are just files for this script to run and do it's work. The key bit is being in the directory/filesystem you want to be monitoring, in this case it's /home as in listed in the du command.

If the email is to the directory owner, then it depends if you have an e-mail address (or could build one) for each user. Perhaps you have it as the user comment so you could extract it from /etc/passwd (usually field 5 I think) Once you have determined the e-mail address, your command could be something like:-

Code:

......
if [ $delta_size -gt 3072000 ]    # I think that this is 30Gb~ish
   then
      echo "You have a quickly growing directory called $dir1\n\nThe administrator." | mail -s "Subject line in here" $email_address
fi

If your email is not based on the same server, then you will need to configure the /etc/sendmail.cf file, however this probably just means setting a DS record (which is commented out by default) to name your e-mail server or some relay that will accept smtp and route it on for you. Find the line that is for the DS statement and uncomment it, adding in your mail server, e.g.:-

Code:

DSyour.mail.server

Make sure that the address can be resolved (DNS prefereably) and that you can open port 25. If you try:-

Code:

telnet your.mail.server 25

... then you should get a HELO reply rather than a timeout.



Does this help a bit more?




Robin
Liverpool/Blackburn

Hi Robin,

This is help a lot lot more...my email is not based on the same server so I will need to make change in the sendmail.cf. I will check this an let you know.

Thanks.

Caveat: That approach will silently implode if files or directories are added to or removed from /home.

Regards,
Alister

Yes, agreed & point taken. I suppose we could cover it off by checking that "$dir1" = "$dir2", but then how you carry on could be a nightmare.

The alternate would be to read the first file and then get the approptaite record from the second, but that's a much bigger thing to think about.

Anyone facy taking it on?



Robin

Hi Guys,

Please give me brief how the original script given by Robin would cause any implode?

Thanks

You would probably learn more if you tried it for yourself. Run the script. Then delete and/or add a directory. Run the script again. Perform the test with pathnames that occur in early in the sort order for maximum effect.

Since those are kilobytes, that's actually closer to 3 gigabytes.

Regards,
Alister