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How to extract IP addresses from Apache log entries?
Upon the apache log entry format you have supplied, the easiest way to extract in IP addresses from this kind of apache log entries is to use a combination of awk, sort and uniq commands. First we need to get a long list of IP addresses. This can be done with awk command: This will create a long list of short IP addresses, each on separate line.
How to validate an IP address in Bash?
In the function valid_ip, the if statement uses a regular expression to make sure the subject IP address consists of four dot separated numbers: if [ [ $ip =~ ^ [0-9] {1,3}. [0-9] {1,3}. [0-9] {1,3}. [0-9] {1,3}$ ]]; then
How to list all IPS in bash script?
The script then stores all IPs in the array variable $ips. This script should do. It’s (almost) pure Bash. The seq part can be replaced if a completely pure bash is required. Since Bash apparently uses signed two-complement 4-byte integers, the script is limited to /8 mask maximum.
How to get list of unique IP addresses?
First we need to get a long list of IP addresses. This can be done with awk command: This will create a long list of short IP addresses, each on separate line. If you intend to count unique visitors on your web site simply redirect the output to wc -l. Submit your RESUME, create a JOB ALERT.
How is AWK used to analyze a log file?
Using awk The principal use of awk is to break up each line of a file into ‘fields’ or ‘columns’ using a pre-defined separator. Because each line of the log file is based on the standard format we can do many things quite easily.
How to see number of visitors to Apache log file?
I recently transferred one of the websites I manage to a new host and wanted to see how many different IPs were reaching the new server. Came up with this chain of commands that I though could be useful to others. first we use the cat command to list all the entries in the apache log file.
What should be included in Apache HTTP server combined log format?
Combined log format The following assumes an Apache HTTP Server combined log format where each entry in the log file contains the following information: The final two items: Referer and User-agent give details on where the request originated and what type of agent made the request.