awk最经典的用法

#!/bin/bash
#check access counts.
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
 export PATHaccess_count(){
 #awk计算列的和
 counts=​​​tail /var/log/nginx/access.log |awk '{print $1}'|awk -F '.' '{print $4}' |awk '{a=a+$1} END {print a}'​​​ echo “access counts is $counts.”
 }main(){
 access_count
 }main