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From: Ronald Fischer <fischerr DOT external AT infineon DOT com>
Subject:  Re: Finding either boot time or login time
Date: Mon, 2 Feb 2009 14:11:11 +0000 (UTC)
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Mark J. Reed <markjreed <at> gmail.com> writes:

> One-liner to display the boot time:
> 
> $ perl -lane 'print ~~localtime(time-$F[0])' /proc/uptime

Thanks a lot! This is great!

Would you mind explaining the ~~ trick? localtime returns a list, so 
I would have concluded that applyiing ~ to this list would force it
into scalar context, so it would bitwise negate the number of elements
in the list. But this is obviously not done, because just by 
trying out your code, I see that it works.

Ronald



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