rate: Continuously display rate of change of numbers in a file.
	(e.g. counts in /proc/* stats files)

Usage: rate <options>

Options:
	-f <file> 	Watch <file> (Default: /proc/net/dev)
	-s <secs>	Sleep <secs> seconds between updates (Default: 2)
	-w <n>		Width of floating point field (Default: 1)
	-x		Start the process up in an xterm of just about the
			right size.

	-ro		Show the rate only, not the total counts.
	-both		Show both the total stats and the rates. (Default)

	-net		Watch /proc/net/dev
	-inter		Watch /proc/interrupts
	-stat		Watch /proc/stat

Notes:
	If "file" is a command like "ls -l foo|", then the rates
	for the command output will be measured. In this case the
	rate of growth of the file can be seen.