Groups > alt.comp.lang.shell.batch.msdos > #12

Re: counting in DOS

From	Francky Leyn <Francky@Leyn.eu>
Newsgroups	alt.comp.lang.shell.batch.msdos
Subject	Re: counting in DOS
Date	2015-07-10 18:41 +0200
Organization	private
Message-ID	<559FF5B3.80103@Leyn.eu> (permalink)
References	<mn54vs$ok0$1@speranza.aioe.org> <mn5bep$l02$1@news.albasani.net> <mnm204$n8p$1@speranza.aioe.org> <mnmpom$k52$1@news.albasani.net>

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On 7/9/2015 11:40 PM, Todd Vargo wrote:
> On 7/9/2015 10:54 AM, Francky Leyn wrote:
>> Hello Todd,
>>
>> The script is now called crop_double.bat :
>>
>> @echo off
>> set "n=1%1"
>
> Creates a variable named "n" and stores the value of %1, prefixed with a
> 1. This is done because some of your file numbers begin with a zero.
>
> So for 041, the value stored is 1041.
>
>
>> set /a n-=1
>
> The /a switch indicates an mathematical operation, in this case it
> subtracts 1 from the value. Without the leading 1, it would provide
> incorrect results including removal of the leading zero(s).
>
> So the value stored becomes 1040.
>
>> set "n=%n:~1%"
>
> This removes the leading 1, so the value stored becomes 040.


Can go a bit more in detail?
Why the 2 % signs?
What means :~ ?


>> mkdir "%CD%\02 crop"
>> i_view32 "%CD%\01 src\%1.jpg" /crop=(0,0,1634,2160,0) /convert="%CD%\02
>> crop\p. %n%.jpg"
>> i_view32 "%CD%\01 src\%1.jpg" /crop=(1634,0,1634,2160,0)
>> /convert="%CD%\02 crop\p. %1.jpg"
>>
>> It does perfecly what I want.
>>
>> If  have a jpg file 041.jpg in "01 src",
>> and if type at the prompt:
>> crop_double 041
>> then 2 jpg files are generated:
>> "02 crop\p. 040.jpg" and
>> "02 crop\p. 041.jpg"
>>
>> However, I would like to understand the set commands.
>> Could you explain in detail what the different set commands do?
>>
>> Best regards,
>>
>> Francky
>
>

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Thread

counting in DOS Francky Leyn <Francky@Leyn.eu> - 2015-07-03 07:01 +0200
  Re: counting in DOS Todd Vargo <tlvargo@sbcglobal.netz> - 2015-07-03 02:52 -0400
    Re: counting in DOS Todd Vargo <tlvargo@sbcglobal.netz> - 2015-07-09 17:40 -0400
      Re: counting in DOS Francky Leyn <Francky@Leyn.eu> - 2015-07-10 18:41 +0200
        Re: counting in DOS Todd Vargo <tlvargo@sbcglobal.netz> - 2015-07-10 12:59 -0400

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