Use cat to count apache log ip addresses

To use cat to count the ip address of an apache log, extract the IP address with the highest access volume from the log. Use shell. Www.2cto.com logs are as follows (for example, the data volume is small): $moreaa.txt 127.0.0.1-frank [10/Oct/2000: 13 :... to use cat to count the ip address of an apache log, extract the IP address with the highest access volume from the log. Use shell. Www.2cto.com logs are as follows (for example, the data volume is small): $ more aa.txt 127.0.0.1-frank [10/Oct/2000: 13: 55: 36-0700] "GET/apache_pb.gif HTTP/1.0" 200 2326 192.168.1.100-frank [10/Oct/2000: 13: 55: 36-0700] "GET/apache_pb.gif HTTP/1.0" 200 2326 192.168.1.100-frank [10/Oct/2000: 13: 55: 36-0700] "GET/apache_pb.gif HTTP/1.0" 200 2326 192.168.1.100-frank [10/Oct/2000: 13: 55: 36-0700] "GET/apache_pb.gif HTTP/1.0" 200 232 6. to extract the IP address with the highest access volume, extract the IP address segment from the log. $ Cat aa.txt | awk-F "" '{print $1}' 127.0.0.1 192.168.1.100 192.168.1.100 192.168.1.100 (PS, which can also be implemented using the cut command here. $ Cut-d ""-f 1 aa.txt 127.0.0.1 192.168.1.100 192.168.1.100 192.168.1.100) 2. check the IP address statistics to see how many times each IP address has appeared $ cat aa.txt | awk-F "" '{print $1}' | uniq-c 1 127.0.0.1 3 192.168.1.100 (PS: wc-l can also calculate the number of rows, but the statistics are the total number of all rows. Does not classify statistics) 3. sort by IP addresses in ascending order $ cat aa.txt | awk-F "" '{print $1}' | uniq-c | sort-r 3 192.168.1.100 1 127.0.0.1 4. extract the IP address segment $ cat aa.txt again | awk-F "" '{print $1}' | uniq-c | sort-r | awk '{print $2}' 192.168.1.100 127.0.0.1 5. select the first line $ cat aa.txt | awk-F "" '{print $1}' | uniq-c | sort-r | awk '{print $2}' | head- 1 192.168.1.100