From: Terry Michaels <spare@...>
Date: 2010-10-09T16:20:30+09:00
Subject: Getting the size of a block device

In Linux at least, one cannot simply get the size of a block device file
(e.g., /dev/sda) by using the normal means of requesting the file size.
One must use a special command, such as

 /sbin/blockdev --getsz /dev/sda

Likewise, my experimentation shows that File.size('/dev/sda') in Ruby
returns a bogus value. How does one get the size of a block device file
in Ruby?

Obviously, I could wrap a system call around a Linux utility or read a
proc file... but I am curious if there is a 'built-in' Ruby method.
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