Mastering Linux Shell Scripting - Second Edition

Displaying the highest ranking IP address

You should now be aware of some the powers of awk and how immense the language structure is in itself. The data we have been able to produce from the 30,000 line file is truly powerful and easily extracted. We just need to replace the field we have used before with $1. This field represents the client IP address. If we make use of the following code, we will be able to print each IP Address and also the number of times it has been used to access the web server:

{ ip[$1]++ } 
END { 
for (i in ip) 
print i, " has accessed the server ", ip[i], " times." } 

We want to be able to extend this to show only the highest ranking IP address, the address that has been used the most to access the site. The work, ...