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Grabbing variables and comparing


 
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# 8  
Old 08-17-2008
I forgot to ask about this in my initial post and I apologize for that.

I need the following command to be executed ONLY if changes have been made to "FILE"

/etc/init.d/service restart

If no changes have been made then the above command should not be executed.

Thanks!!!!
# 9  
Old 08-17-2008
If you keep a dummy file whose modification date indicates when the service was restarted, you can figure out whether FILE or the dummy file is newer. If FILE is newer then it was modified after the service was last restarted. But it requires the discipline that you update the timestamp of the dummy file each time you restart the service.
# 10  
Old 08-17-2008
Quote:
Originally Posted by kerpm
I forgot to ask about this in my initial post and I apologize for that.

I need the following command to be executed ONLY if changes have been made to "FILE"

/etc/init.d/service restart

If no changes have been made then the above command should not be executed.

Thanks!!!!
Code:
perl -pe 'use Socket; next unless /(\d+.\d+.\d+.\d+)\s#(.*?)\s*$/; $dig=inet_ntoa(inet_aton($2)); if ($dig ne $1) { s/$1/$dig/; $changed=1; } END { system "sleep 60 && /etc/init.d/service restart &" if $changed }' FILE > FILE.new && mv FILE.new FILE

that will execute /etc/init.d/service restart 60 seconds after an entry in FILE has been changed. The 60 seconds are needed and the '&' in the end is most important because this "script" needs to complete moving FILE.new to FILE before /etc/init.d/service can read the updated FILE. Otherwise your service would read the old entry instead of the newly created one.

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