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      1  AH00126: Invalid URI in request GET  HTTP/1.1
      1  PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 32 bytes) in /var/www/con/libraries/joomla/database/driver/mysql.php on line 425
    108  PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 512 bytes) in /var/www/es/libraries/joomla/database/driver/mysql.php on line 425
    156  PHP Notice:  Undefined index: select in /var/www/con/cli/form_output.php on line 3
    156  PHP Notice:  Undefined index: inputfrom_value in /var/www/con/cli/form_output.php on line 2
    157  PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 83 bytes) in /var/www/es/libraries/joomla/database/driver/mysql.php on line 425
    202  PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 32 bytes) in /var/www/es/libraries/joomla/database/driver/mysql.php on line 425
    218  PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 80 bytes) in /var/www/es/libraries/joomla/database/driver/mysql.php on line 425
    316  PHP Notice:  Undefined index:  in /var/www/conven/cli/units.php on line 513
    520  PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 81 bytes) in /var/www/es/libraries/joomla/database/driver/mysql.php on line 425

Based in http://strictcoder.blogspot.com/2012/02/linux-count-unique-error-log-entries.html

#!/bin/bash
sed 's^\[.*\]^^g' error.log | sed 's^\, referer: [^\n]*^^g' | sort | uniq -c | sort -n