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script for Trimming the log files

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# 1  
Old 06-26-2012
script for Trimming the log files
Dear Gurus,

Trimming the alert log files of oracle. I need to write a script retaining last 20 lines of the log files and deleting all the other lines
I tried with tail -20 , Please help me how to delete all the other lines, my log files has grown upt to 2G.

Thanks in Advance
Dave
# 2  
Old 06-26-2012
What OS and version are you using?
# 3  
Old 06-26-2012
OEL 5.5
# 4  
Old 06-26-2012
The workflow could be:
Code:
cp -p altert.log alert.log.bk
tail -20  alert.log.bk >altert.log

This User Gave Thanks to Klashxx For This Post:
dave234
# 5  
Old 06-26-2012
Thanks for workflow, I am a new bie in linux , I tried with this script in the test environment and worked. I would also like to know is there any alarm when i am executing this script and at the same time if oracle tries to write to this log..

Thanks in Advance
Dave
# 6  
Old 06-27-2012
Block the alert_log file during the purgue , but I don't think that's a good idea.
The rotation should be very fast anyway. You hardly miss a message.

Regards
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