Batch Coding For loop to create files with different names

Question

I'm new to Batch coding, so please go easy.

Please consider the following code:

FOR /L %%G IN (1,1,20) DO (break>"C:\New folder\%%G+1.txt")

I'm trying to create text files with the above code, but I'm getting 1+1, 2+1, 3+1.. and so on.

Is there a way to not touch the parameters, but to increase the parameter in %%G+1? Instead of outputting as a string, it gives me a number.

Please guide me. thanks

Update: I tried this code below

:MakeTextFiles
setlocal enabledelayedexpansion
set "var=1"
FOR /L %%G IN (1,1,20) DO 
(       
    set /a "var=%var%+1" 
    break>"C:\New folder\!var!.txt"
)
EXIT /B

But it's not working.

read again about [delayed expansion](http://stackoverflow.com/questions/30282784/combining-all-mp4s-in-directory-with-ffmpeg/30284028#30284028) and "The ( must be on the same physical line as the do" from Magoos answer. — Stephan, Apr 15 '16 at 07:52
Got it! Thanks. Still new to this. So there might be some errors on syntax. — NewbieCoder, Apr 15 '16 at 08:13
yeah - batch syntax isn't consistent and sometimes not very intuitive. Don't mind - the day you don't produce syntax errors any more is far far far away :) — Stephan, Apr 15 '16 at 08:20

score 1 · Answer 1 · edited May 23 '17 at 12:16

1

You don't need arithmetic addition here, just change the set you loop over:

FOR /L %%G IN (2,1,21) DO (break>"C:\New folder\%%G.txt")

If you definitely want arithmetic:

setlocal enabledelayedexpansion
FOR /L %%G IN (1,1,20) DO (
set /a var=%%G+1
break>"C:\New folder\!var!.txt")

You need to look here:

calculating the sum of two variables in a batch script

and here delayed expansion

edited May 23 '17 at 12:16

Community

1
1

answered Apr 15 '16 at 07:13

CodeMonkey

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I do not want to touch the parameter. – NewbieCoder Apr 15 '16 at 07:14
I added a link to the arithmetic answer. – CodeMonkey Apr 15 '16 at 07:16
1

additionally you'll need [delayed expansion](http://stackoverflow.com/a/30284028/2152082) – Stephan Apr 15 '16 at 07:18
Thank you Stephan, you're right. I amended the answer. – CodeMonkey Apr 15 '16 at 07:29

Magoo · Accepted Answer · 2016-04-15T07:44:05.843

setlocal enabldelayedexpansion
FOR /L %%G IN (1,1,20) DO 
(
    set /a _new=%%G+1
    break>"C:\New folder\!_new!.txt"
)

Please see hundrds of articles on SO about delayedexpansion

Two problems with your latest change:

The ( must be on the same physical line as the do.

set /a var=!var!+1

or

set /a var=var+1

or

set /a var+=1

set /a accesses the run-time value of var, !var! is the run-time value of var, %var% is the parse-time value of var - the value that it has when the for is encountered.

Batch Coding For loop to create files with different names

2 Answers2