File handling in Batch programming?

Question

I have a text file that has a number in every new line and all are in ascending order.

Contents are like :

1 13 25 37 49 97 109 121

I want to extract only those numbers who have difference greater than 12, with the previous number. I wish to use batch program for this....

How can I do that ?

This strongly looks like a homework assignment - not good... — Lizz
– Lizz, Commented Dec 26, 2012 at 18:42

Preet Sangha · Accepted Answer · 2012-12-25 12:11:29Z

I would have liked to see you make an attempt but anyway I had a go and this is the closest I could get

c:\temp>type test.txt 1 line 1 10 line 1a 13 line 2 25 line 3 22 line 3a 37 line 4 49 line 5 97 line 6 109 line 7 121 line 8 c:\temp>test.bat 25 line 3 37 line 4 49 line 5 97 line 6 109 line 7 121 line 8 c:\temp>

using this code in test.bat:

@echo off SETLOCAL ENABLEDELAYEDEXPANSION set /a cur="0" for /f "tokens=1,* delims= " %%a in ('type test.txt') do ( set line=%%a %%b set /a num="%%a" set /a dif="!num!-!cur!" if !dif! geq 12 @echo !line! set /a cur="%%a" )

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