Sample AWK

aggregation.sh

#!/bin/sh
# Iterate over a csv file and aggregate items.
# in BEGIN we define global variables.
# in the middle block we define the logic.
# in the END we define the conclusion logic like prints etc.
# NR>1 means ignore the first line.
awk -F "," 'BEGIN {
    delete visited_items;
}
NR>1 {
    visited_items[$2] += $3;
}
END {
    for(item in visited_items) {
        print item "=" visited_items[item];
    }
}' sample.csv

sample-awk-file.awk

#!/usr/bin/env awk -f

function say_hello(name) {
    print "Hello " name
}

function say_bye(name) {
    print "Goodbye! " name
}

BEGIN {
    name = "Mort";
}
{
    say_hello(name);
    exit;
}
END {
    say_bye(name);
}

sample.csv

sample.sh

#!/bin/sh
# Iterate over a csv file and tell us what ranks are more than 10 and what are less than 10.
# in BEGIN we define global variables.
# in the middle block we define the logic.
# in the END we define the conclusion logic like prints etc.
# NR>1 means ignore the first line.
awk -F "," 'BEGIN {
    passed = 0;
    failed = 0;
}
NR>1 {
    if ($3 >= 10) {
        passed += 1;
    } else {
        failed += 1;
    }
}
END {
    print "PASSED:" passed;
    print "FAILED:" failed;
}' sample.csv