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 and "The ( must be on the same physical line as the do" from Magoos answer. — Stephan
– Stephan, Commented Apr 15, 2016 at 7:52
Got it! Thanks. Still new to this. So there might be some errors on syntax. — NewbieCoder
– NewbieCoder, Commented Apr 15, 2016 at 8:13
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
– Stephan, Commented Apr 15, 2016 at 8:20

Magoo · Accepted Answer · 2016-04-15 07:44:05Z

1

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.

edited Apr 15, 2016 at 7:44

answered Apr 15, 2016 at 7:35

Magoo

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Comments

Community · Accepted Answer · 2017-05-23 12:16:01Z

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, 2017 at 12:16

CommunityBot

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answered Apr 15, 2016 at 7:13

CodeMonkey

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4 Comments

NewbieCoder Over a year ago

I do not want to touch the parameter.

CodeMonkey Over a year ago

I added a link to the arithmetic answer.

Stephan Over a year ago

additionally you'll need delayed expansion

CodeMonkey Over a year ago

Thank you Stephan, you're right. I amended the answer.

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