Mastering Linux Shell Scripting - Second Edition

Summarizing HTTP access codes

It is time for us to leave the pure command line and start working with the AWK control files. As always, when the complexity of the required result set increases, we see an increase in the complexity of the awk code. We will create a status.awk file in our current directory. The file should look similar to the following file:

{ record[$9]++ } 
END { 
for (r in record) 
print r, " has occurred ", record[r], " times." }  

First, we will strip down the main code block and this is very simple and sparse. This is a simple way to count each unique occurrence of a status code. Instead of using a simple variable, we feed this into an array. The array in this case is called a record. An array is a multi-values variable and ...