Re: Can Bash do simple math?

[alex xmb sw ratchev]

also btw for preciese timings
u need float math
like with awk

two methods

use date +%s.%N

or inline script
do
timemarker+=( $EPOCHREALTIME )
on beginning
and end
and math together , like

awk '{

.. i was writing
any idea why following exits android termux ? andro kill policy ?

~ $ alias tm='timemark+=( $EPOCHREALTIME )'    ~ $ tm ; sleep .313373 ; tm
; IFS=- ; gawk ' { print ( $0 ) } ' <<<"${timemark[*]: -2:2}"
Vim: Caught deadly signal 'SIGTERM'

[Process completed (signal 11) - press Enter]

On Tue, Aug 6, 2024, 18:24 alex xmb sw ratchev <fxmbsw7@gmail.com> wrote:

>
>
> On Tue, Aug 6, 2024, 17:53 Greg Wooledge <greg@wooledge.org> wrote:
>
>> On Tue, Aug 06, 2024 at 17:08:23 +0200, alex xmb sw ratchev wrote:
>> > i really dont see why 60
>>
>> Because there are 60 seconds in each minute, and 60 minutes in each hour.
>>
>> Let's say you measure how long a program takes to run, and it ends up
>> being 179 seconds.  You'd like to convert this number (179) to an
>> interval expressed as "x minutes and y seconds".
>>
>> There are a few ways you can do this.  They all give you the same answer.
>>
>> The way that I find simplest to understand is always to divide by the
>> next conversion factor.  So:
>>
>>  1) We divide 179 by 60, to get the number of minutes.
>>
>
> u misread big
> the users original code
> makes , seconds minus math
> the currency of it is still 1second
>
> now look what u write
> ' to get minutes '
>
> i say users code has
> seconds = diffinseconds % 60
> not
> minutes = diffinseconds % 60
>
> i use / 60 anyway
> i must benchmark somewhen
>
>     We're using integer division, so any fractions are discarded.
>>     179 / 60 = 2
>>     So the final answer includes "2 minutes" as the first component.
>>
>>  2) Now that we know how many whole minutes there are, we remove those
>>     from the original number.
>>     2 * 60 = 120
>>     We decrease the original number by 120.
>>     179 - 120 = 59
>>
>>  3) The amount that's left over (59) is the number of seconds.
>>     So our final answer is "2 minutes and 59 seconds".
>>
>> The conversion that the OP used is very similar to this, except they
>> went for hours, minutes and seconds.
>>
>> Let's say you run a different program and it takes 7701 seconds, and
>> you'd like to convert this to "x hours, y minutes and z seconds".  We
>> can apply a similar recipe:
>>
>>  1) Divide 7701 by 3600 to get the number of whole hours.
>>     7701 / 3600 = 2
>>     "2 hours"
>>
>>  2) Subtract the whole hours from the original number.
>>     7701 - (2 * 3600) = 501
>>
>>  3) Divide by 60 to get the number of minutes.
>>     501 / 60 = 8
>>     "8 minutes"
>>
>>  4) Subtract the whole minutes from the original number
>>     501 - (8 * 60) = 21
>>
>>  5) The remaining number is the number of seconds.
>>     "21 seconds"
>>
>> So in this case, our final answer is "2 hours, 8 minutes and 21 seconds".
>>
>> The OP chose to use slightly different recipes, which involve modulus
>> and which don't decrease the total as we go.  That's fine.  As I said,
>> there are different ways to do it, which all give the same answer.
>>
>>