stats.py

text/x-python

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#!/usr/bin/env python

import sys

first_block = int(sys.argv[1])
last_block = int(sys.argv[2])

nblocks = 0
nruns = 0
nforward = 0
nbackward = 0

prev_block = 0

for line in sys.stdin:

	b = int(line)

	if b < first_block or b > last_block:
		continue

	nblocks += 1

	if b != prev_block:
		nruns += 1

	if b > prev_block and prev_block != 0:
		nforward += 1

	if b < prev_block and prev_block != 0:
		nbackward += 1

	prev_block = b

print (nblocks, nruns, nforward, nbackward)