Batch File: Append a string inside a for loop

Question

I have the following for loop:

for /l %%a in (1,1,%count%) do (
<nul set /p=" %%a - "

Echo !var%%a!
)

which will display something like this:

1 - REL1206
2 - REL1302
3 - REL1306

I need to create a variable that appends itself based on the number of iterations. Example the variable would look like this after the for loop:

myVar="1, 2, 3"

Endoro · Accepted Answer · 2013-09-03 20:32:37Z

28

example:

@ECHO OFF &SETLOCAL
SET /a count=5
for /l %%a in (1,1,%count%) do call set "Myvar=%%Myvar%%, %%a"
ECHO %Myvar:~2%

..output is:

1, 2, 3, 4, 5

answered Sep 3, 2013 at 20:32

Endoro

37.7k8 gold badges54 silver badges64 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Val Over a year ago

I wonder where has the first comma gone and what is the point of calling the set operation?

thomasrutter Over a year ago

The first comma and space are skipped by the line echo %Myvar:~2% which outputs a substring of %Myvar% starting after the first two characters,

Fábio Amorim Over a year ago

Finally a working code!!! There's a considerable time since I've started to look for this. Thanks!

kxr Over a year ago

The "call" does the magic. W/o it doesn't accumulate. I searched a while to find this. But what does this, why is this? The "call" doc says "Calls one batch program from another" ...?

Endoro Over a year ago

„Batch‟ is magic :-)

springer38 · Accepted Answer · 2013-09-03 20:12:13Z

10

Use delayed expansion

setlocal enableextensions enabledelayedexpansion
SET OUTPUTSTRING=
for /l %%a in (1,1,%count%) do (
<nul set /p=" %%a - "
Echo !var%%a! 
if .!OUTPUTSTRING!==. (
    SET OUTPUTSTRING=%%a
) ELSE (
    SET OUTPUTSTRING=!OUTPUTSTRING!, %%a
)
)
SET OUTPUTSTRING

answered Sep 3, 2013 at 20:12

springer38

1012 bronze badges

Collectives™ on Stack Overflow

Batch File: Append a string inside a for loop

2 Answers 2

5 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

5 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related