#!/bin/sh
null() {
	:
}

if [ "$1" == "-q" ]; then
	echo "echo off"
	ECHO="null"
	shift
else
	echo "echo on"
	ECHO=echo
fi
vmstat 1 | while read LINE ; do
	LINE="`date +%s`: $LINE"
	$ECHO "$LINE"
	[ "$1" ] && echo "$LINE" >> $1
done