> Arithmetic Expansion
> Arithmetic expansion allows the evaluation
> of an arithmetic expression and the substitution
> of the result.
>
> The format for arithmetic expansion is:
>
> $((expression))
>
> The old format $[expression] is deprecated
> and will be removed in upcomin
On 2008-08-26 11:50, Ron Johnson wrote:
> On 08/25/08 20:34, s. keeling wrote:
>> Ron Johnson <[EMAIL PROTECTED]>:
>>> On 08/24/08 11:32, Rick Pasotto wrote:
Why pipe it to bc? Keep it in the shell:
$ echo $[$[$(date -d 20090824 +%s) - $(date -d 20080724 +%s)] / 86400]
396
>>>
On Tue, Aug 26, 2008 at 04:50:16AM -0500, Ron Johnson wrote:
> On 08/25/08 20:34, s. keeling wrote:
>> I've been running *nix on my home boxes since '93, and I've never even
>> seen that syntax. That's a bashism, I hope?
>
> Yes. And a relatively modern one at that. Somewhere in the 3.x series.
On 08/25/08 20:34, s. keeling wrote:
Ron Johnson <[EMAIL PROTECTED]>:
On 08/24/08 11:32, Rick Pasotto wrote:
Why pipe it to bc? Keep it in the shell:
$ echo $[$[$(date -d 20090824 +%s) - $(date -d 20080724 +%s)] / 86400]
396
[snip]
One stylistic reason for piping to bc is that some people
Ron Johnson <[EMAIL PROTECTED]>:
> On 08/24/08 11:32, Rick Pasotto wrote:
> >
> > Why pipe it to bc? Keep it in the shell:
> >
> > $ echo $[$[$(date -d 20090824 +%s) - $(date -d 20080724 +%s)] / 86400]
> > 396
>
> [snip]
>
> One stylistic reason for piping to bc is that some people think that
On 2008-08-24 12:25:00 -0500, Ron Johnson wrote:
> I was thinking that integer division might result in the occasional
> rounding error.
This is the contrary: AFAIK, you really want an integer division.
So, integer arithmetic is OK. But a floating-point division can
be a problem since when the f
On 2008-08-24 11:13:43 -0500, Ron Johnson wrote:
> I think I'd write a simple Python/Perl script: convert date1 and date2 to
> seconds past epoch, subtract, and divide by 86400.
In Perl, you can also use the Date::Manip module:
4. The amount of time between two dates.
$date1 =
On 08/24/08 12:41, Damon L. Chesser wrote:
On Sun, 2008-08-24 at 11:25 -0500, Ron Johnson wrote:
On 08/24/08 10:54, Edward J. Shornock wrote:
[snip]
While I'm sure someone else will provide a much better way, I've used
something like
$ echo $(date -d 20080824 +%j) - $(date -d 20080724 +%j)
On 24 Ago, 17:10, "j t" <[EMAIL PROTECTED]> wrote:
> [snip]
>
> (I'm happy to use any date format for input - I've only used ISO8601
> as an example)
Maybe something like that:
#!/usr/bin/python
from time import mktime, strptime
from sys import argv
class DummyDate:
def __init__(self, strda
On Sun, 2008-08-24 at 11:25 -0500, Ron Johnson wrote:
> On 08/24/08 10:54, Edward J. Shornock wrote:
> [snip]
> >
> > While I'm sure someone else will provide a much better way, I've used
> > something like
> >
> > $ echo $(date -d 20080824 +%j) - $(date -d 20080724 +%j) | bc
> > 31
>
> That
On 08/24/08 11:32, Rick Pasotto wrote:
On Sun, Aug 24, 2008 at 11:25:31AM -0500, Ron Johnson wrote:
On 08/24/08 10:54, Edward J. Shornock wrote:
[snip]
While I'm sure someone else will provide a much better way, I've used
something like
$ echo $(date -d 20080824 +%j) - $(date -d 20080724 +
On Sun, Aug 24, 2008 at 11:25:31AM -0500, Ron Johnson wrote:
> On 08/24/08 10:54, Edward J. Shornock wrote:
> [snip]
>>
>> While I'm sure someone else will provide a much better way, I've used
>> something like
>>
>> $ echo $(date -d 20080824 +%j) - $(date -d 20080724 +%j) | bc
>> 31
>
> That a
On 08/24/08 10:54, Edward J. Shornock wrote:
[snip]
While I'm sure someone else will provide a much better way, I've used
something like
$ echo $(date -d 20080824 +%j) - $(date -d 20080724 +%j) | bc
31
That a good idea. I never knew date(1) could do that. The problem,
though, is that i
j t wrote:
Hi all.
Does anyone have any suggestions for a command-line-interface (CLI)
calculator that can work out the difference between 2 (gregorian)
dates (i.e. that is calendar aware). My favourite cli calculator
("bc") doesn't seem to have any knowledge of the gregorian calendar.
Just to
On 08/24/08 10:07, j t wrote:
Hi all.
Does anyone have any suggestions for a command-line-interface (CLI)
calculator that can work out the difference between 2 (gregorian)
dates (i.e. that is calendar aware). My favourite cli calculator
("bc") doesn't seem to have any knowledge of the gregorian
On Sunday 24 August 2008 18.07.59 j t wrote:
> Hi all.
>
> Does anyone have any suggestions for a command-line-interface (CLI)
> calculator that can work out the difference between 2 (gregorian)
> dates (i.e. that is calendar aware). My favourite cli calculator
> ("bc") doesn't seem to have any kno
Hi all.
Does anyone have any suggestions for a command-line-interface (CLI)
calculator that can work out the difference between 2 (gregorian)
dates (i.e. that is calendar aware). My favourite cli calculator
("bc") doesn't seem to have any knowledge of the gregorian calendar.
Just to make it clear
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