Groups > alt.comp.lang.shell.batch.msdos > #11

Re: counting in DOS

From	Todd Vargo <tlvargo@sbcglobal.netz>
Newsgroups	alt.comp.lang.shell.batch.msdos
Subject	Re: counting in DOS
Date	2015-07-09 17:40 -0400
Organization	albasani.net
Message-ID	<mnmpom$k52$1@news.albasani.net> (permalink)
References	<mn54vs$ok0$1@speranza.aioe.org> <mn5bep$l02$1@news.albasani.net> <mnm204$n8p$1@speranza.aioe.org>

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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.

> 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

-- 
Todd Vargo
(Post questions to group only. Remove "z" to email personal messages)

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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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