I have a huge mysql.log file full of errors. I'd like to sort it by the most common line, and work from there. I did go through the manpage for sort, and googled a bit, but I found nothing relevant. Here is an example of the output: [root@ log]# tail mysqld.log 110925 11:05:35 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_summary_ad_hourly.MYI'; try to repair it 110925 11:05:35 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_summary_ad_hourly.MYI'; try to repair it 110925 12:05:28 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_intermediate_ad.MYI'; try to repair it 110925 12:05:28 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_intermediate_ad.MYI'; try to repair it 110925 12:05:28 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_intermediate_ad.MYI'; try to repair it 110925 12:05:28 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_summary_ad_hourly.MYI'; try to repair it 110925 13:09:43 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_intermediate_ad.MYI'; try to repair it 110925 13:09:43 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_intermediate_ad.MYI'; try to repair it 110925 13:09:43 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_intermediate_ad.MYI'; try to repair it 110925 13:09:43 [ERROR] /usr/libexec/mysqld: Incorrect key file for table './ox_data_summary_ad_hourly.MYI'; try to repair it [root@ log]# wc -l mysqld.log 20686 mysqld.log [root@ log]# cat mysqld.log | grep ERROR | wc -l 20332 [root@ log]# Is there a way to get the most common (unique) lines of the file? By the way, I'm not sure if this is RHEL or CentOS, or which version: [root@ log]# uname -a Linux example.com 2.6.18-194.32.1.el5xen #1 SMP Wed Jan 5 18:44:24 EST 2011 x86_64 x86_64 x86_64 GNU/Linux [root@ log]# uname -o GNU/Linux [root@ log]# I assume that it is one of these, as Yum is installed. How would I find out? Thanks! -- Dotan Cohen http://gibberish.co.il http://what-is-what.com