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Re: off topic: uptime question




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On Tue, Oct 24, 2017 at 12:50:03AM +0900, Byung-Hee HWANG (황병희, 黃炳熙) wrote:
> #+BEGIN_SRC ruby
> require "date"
> 
> uptime_data = IO.read('/proc/uptime').split[0].to_i
> sboot = Time.now - uptime_data
> 
> if uptime_data >= 86400
> 	uptime = Time.at(uptime_data).utc.strftime("%d days %H:%M")
> else
> 	uptime = Time.at(uptime_data).utc.strftime("%H:%M")
> end
> 
> puts uptime.to_s + " (" + sboot.to_s + ")"
> #+END_SRC
> 
> Then i do ruby cmd and shell cmd at Ubuntu (chromebook).
> Ruby: 28 days 09:23 (Tue Sep 26 15:19:58 +0900 2017)
> Bash: 00:43:33 up 27 days,  9:23,  0 users,  load average: 0.01, 0.10, 0.21
> 
> Why the result is different? Ruby result is more 1 day than shell result.
> Guide me please... thanks in advance^^^
> 
> Sincerely, Byung-Hee.

This is more of a Ruby question. *If* (a big if, I don't know Ruby that well)
strftime is similar to the Unix library function strftime, the "%d" placeholder
you use there stands for the "day of the month", which counts from one, not from
zero. This function is made for the formatting of *dates*, not *time intervals.

That would mean that you might get even funnier results if your uptime
is more than (around) 30-31 days.

If that is the case I fear you'll have to find other conversion functions
or write up something yourself.

HTH
- -- tomás
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