On Tue, Feb 08, 2005 at 07:14:05AM +0000, Stroller wrote:
> Hihi,
>
> I needed just now to count today how many days have elapsed since the
> 3rd of January. Rather than reach for a calendar and count days
> arduously, I figured this was a task very suited to a computer. I'm
> sure, however, my solution took me longer than the manual one would
> have - can anyone suggest a better one?
>
> I know that `date` can provide the date in seconds since the epoc, and
> after a couple of readings of the `man` page I discovered that `info
> date` is FAR more comprehendible.
>
> $ date +%s
> 1107845877
> $ date +%s -d '3 Jan'
> 1104710400
>
> Ok... so a Google for Bash mathematics turns up
> <http://en.wikipedia.org/wiki/Bash#Integer_mathematics>, and after some
> experimentation I came up with:
>
> $ echo $(( $((`date +%s` - `date --date='3 Jan' +%s`)) / 60 / 60 / 24
> ))
echo "`date +%s` - `date --date='3 Jan' +s%s` / ( 60*60*14)" | bc
a little bit less of "$((" ...
but i don't know a better way
--
_
|
YoYo () Siska
========================
http://www.ksp.sk/
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