#!/bin/sh
# Usage: space <file>
# Trim trailing whitespace and consecutive newlines.

i=$1

if [ $# != 1 ] ; then
	cat <<-EOF
	Usage: ${0##/*} <file>
	Trim trailing whitespace and consecutive newlines.
	EOF
fi

sed -E '/[[:space:]]+$/s:[[:space:]]+$::' "$i" | \
	awk '{
	if (NF == 0) {
		while (NF == 0)
			if (getline == 0)
				exit
		print ""
	}
	print
	}'