awk count client ip occurrence in log files

Problem:  report the number of errors produced by individual clients

This may be useful for tracking down attacks.

cat error_log | awk '{print $11}' | awk -F: '{print $1}' | sort | uniq -c

Problem:  report the number of hits by the top 10 clients

This may be useful for tracking down attacks.

#get top 10 client IPs of top 10 hit count from common format access log
cat  access_log | awk '{print $1}' | awk -F: '{print $1}' | sort | uniq -c | sort -bnr | head -10