Compute git commit volumes for each hour of the week.

week-volumes.sh

#!/bin/bash

git log --format=format:"%aD" | gawk '

match($0, /^([[:alnum:]]{3}), [[:digit:]]+ [[:alpha:]]{3} \
[[:digit:]]+ ([[:digit:]]+):[[:digit:]]+:[[:digit:]]+/, mt) {
    days[mt[1]]["count"]++;
    days[mt[1]]["hours"][+mt[2]]++;
    total["count"]++;
    total["hours"][+mt[2]]++;
}

function print_day(name, day) {
    printf "%s,%d", name, day["count"];
    for (hour = 0; hour < 24; hour++) {
        printf ",%d", day["hours"][hour];
    }
    printf "\n"
}

END {
    for (day in days)
        print_day(day, days[day]);
    print_day("total", total);
}

'