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At present in my server the log folder was filled up and causing memory issue.
So I am planning to write a script in such a way that the files which are older than 30 days will be deleted and also need to find the files which were not compressed and need to compress this file. Compression will exclude if the file was created on the same day.
I am new to Unix .Please bear me.
What you need is logrotate. It can both delete older files and gzip the other ones except the log currently used. Take a look here for a little explanation about how to do that and feel free to ask if in doubt.
If you don't run any command/script after the files have been rotated, you don't really need the postrotate/endscript and the sharedscripts directives. Also the rotate directive considers the number of rotations and yes... if the logs are rotated daily (as in your example, since you didn't specify any of weekly, monthly or size) they will be kept for 30 days. This should be fine:
You can create this file as /etc/logrotate.d/jboss and it should start to make its work as soon as the system crontab executes /etc/cron.daily/logrotate (be sure you have logrotate installed and the cron daemon is running).
So the above script will work like it will delete old files which are older then 30 days and also zip the files which was less than 30 days...and it won't zip the file which was created on the same day .