What does this line do?

What does the following line do?

echo up for `cat  /proc/uptime` secs  | grep –v 1234 >  test
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slaviknAuthor Commented:
Oh... I've found out what it does.
I just don't understand why the file
contains two numbers.
What does each number mean?
the first number time since start in seconds  (the uptime you get if you type "uptime")

I'm not sure about the second one, but my guess is that it's system idle time (rather than system usage), also  in seconds

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slaviknAuthor Commented:
Thanks (already found it).
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