I have build a unix script to delete last 30 days of entry from db2diag.log. Is there any command to delete the entries for the past 30 days and compress the existing db2diag.log file. Please let me know how can i do it.

Regards
Rajesh Krishnan

Found a solution the problem.

In order to delete the entries in db2diag.log you can do the following
Run the following command
find . -mtime +30
Delete the file prior to 30 days
find . -mtime +30 -exec rm {}\;

Regards
Rajesh Krishnan

This will only work if you rename the db2diag.log every day so that DB2 starts a new file each day. Otherwise, the db2diag.log will continue to collect new messages and the modified-timestamp won't be older than 30 days.