#! /usr/bin/env bash
#
# Usage: average <match> <file>
#    ex: average Total ./myFile
#

grep -e "$1" "$2" | awk -v what="$1" -F: '
BEGIN {sum = 0; count = 0; units = ""}
{
    split($2, parts, " ");
    sum += parts[1]+0;
    count++;
    if (units == "") {
        units = parts[2];
    }
}
END {print what " (av):", sum/count, units}
'