#!/bin/sh

trap "exit 1" USR1

err() {
        printf "error: server not detected, needs to be set manually\n" >&2
        printf "set \$SERVER or modify the script itself\n" >&2
        kill -USR1 "$$"
}

# ... && ... || is not an if-then-else, but this works because
# there's no way for only one printf to fail
[ -z "$SERVER" ] && SERVER=$(which > /dev/null 2>&1 apache2 && printf "apache2" || which > /dev/null 2>&1 nginx && printf "nginx" || err)

{ cat /var/log/"$SERVER"/access.log /var/log/"$SERVER"/access.log.1; gzip -cd $(ls /var/log/"$SERVER"/access.log.*.gz | sed 's/.*\.\([0-9]*\)\.gz/\1 &/' | sort -n | cut -d' ' -f2-); } | grep -a "$@" | awk 'match($0, /" [0-9]{3} [0-9]+ "/) { matchp = substr($0, RSTART, RLENGTH); split(matchp, nums, " "); n+=nums[3] } END { y=0; split("B K M G T", units); while (n >= 1024 && y < 4) { n /= 1024; y++; } if (y == 0) { print n } else if (n < 10) {printf "%.1f%c\n", n, units[y+1] } else { printf "%d%c\n", n, units[y+1]} }'