minix/usr.sbin/traceroute/median.awk

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#!/bin/awk -f
# $NetBSD: median.awk,v 1.5 1997/10/04 16:31:32 christos Exp $
/^ *[0-9]/ {
# print out the median time to each hop along a route.
tottime = 0; n = 0;
for (f = 5; f <= NF; ++f) {
if ($f == "ms") {
++n
time[n] = $(f - 1)
}
}
if (n > 0) {
# insertion sort the times to find the median
for (i = 2; i <= n; ++i) {
v = time[i]; j = i - 1;
while (time[j] > v) {
time[j+1] = time[j];
j = j - 1;
if (j < 0)
break;
}
time[j+1] = v;
}
if (n > 1 && (n % 2) == 0)
median = (time[n/2] + time[(n/2) + 1]) / 2
else
median = time[(n+1)/2]
print $1, median
}
}