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Pass environmental variables by reference from one to another batch file

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;

0

I'm in this situation where I have one batch file which creates a bunch of variables, then starts (with start /w "file.batch") another batch file that uses and modifies the variables from the first batch file.

Now this works fine until the second file closes itself and returns to the first file, because the variables that were modified by the second file are not references to, but actually copy's of the original variables, meaning that they were no longer linked to the original variables. This renders the second script practically useless.

I know that call "file.batch" would run the second file in the same environment, which would fix the problem, but I want the second file to run in a separate window, which call "file.batch" doesn't.

Here's a quick demonstration of the problem:

File 1:

@echo off
set $var=0
echo before starting file 2: %$var%
start test02.bat
echo after starting file 2: %$var%
echo before calling file 2: %$var%
call test02.bat
echo after calling file 2: %$var%
pause&exit

File 2:

@echo off
echo inside file 2: %$var%
set $var=1
echo inside file 2: %$var%
exit /b 0

Output:

before starting file 2: 0

inside file 2: 0
inside file 2: 1

after starting file 2: 0
before calling file 2: 0
inside file 2: 0
inside file 2: 1
after calling file 2: 1

batch-file pass-by-reference

share|improve this question

edited Mar 22 at 13:59

double-beep

3,13641532

asked Mar 22 at 9:37

Lenard van der MaasLenard van der Maas

457

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  No. There is not. This is well known.
  
  – Noodles
  Mar 22 at 9:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well.. The only way would be to loop it to check if the second batch is running, if not, start it and only then echo stuff, but that is really alot of work compared to where you could just call the file.
  
  – Gerhard Barnard
  Mar 22 at 10:10
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the answers, I'll to do it by storing all the echo'd text in an array so when a part of the console has to be cleared, the text above it can be restored
  
  – Lenard van der Maas
  Mar 22 at 13:13
  

  
  
  
  

add a comment | 

0

I'm in this situation where I have one batch file which creates a bunch of variables, then starts (with start /w "file.batch") another batch file that uses and modifies the variables from the first batch file.

Now this works fine until the second file closes itself and returns to the first file, because the variables that were modified by the second file are not references to, but actually copy's of the original variables, meaning that they were no longer linked to the original variables. This renders the second script practically useless.

I know that call "file.batch" would run the second file in the same environment, which would fix the problem, but I want the second file to run in a separate window, which call "file.batch" doesn't.

Here's a quick demonstration of the problem:

File 1:

@echo off
set $var=0
echo before starting file 2: %$var%
start test02.bat
echo after starting file 2: %$var%
echo before calling file 2: %$var%
call test02.bat
echo after calling file 2: %$var%
pause&exit

File 2:

@echo off
echo inside file 2: %$var%
set $var=1
echo inside file 2: %$var%
exit /b 0

Output:

before starting file 2: 0

inside file 2: 0
inside file 2: 1

after starting file 2: 0
before calling file 2: 0
inside file 2: 0
inside file 2: 1
after calling file 2: 1

batch-file pass-by-reference

share|improve this question

edited Mar 22 at 13:59

double-beep

3,13641532

asked Mar 22 at 9:37

Lenard van der MaasLenard van der Maas

457

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  No. There is not. This is well known.
  
  – Noodles
  Mar 22 at 9:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well.. The only way would be to loop it to check if the second batch is running, if not, start it and only then echo stuff, but that is really alot of work compared to where you could just call the file.
  
  – Gerhard Barnard
  Mar 22 at 10:10
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the answers, I'll to do it by storing all the echo'd text in an array so when a part of the console has to be cleared, the text above it can be restored
  
  – Lenard van der Maas
  Mar 22 at 13:13
  

  
  
  
  

add a comment | 

I'm in this situation where I have one batch file which creates a bunch of variables, then starts (with start /w "file.batch") another batch file that uses and modifies the variables from the first batch file.

Now this works fine until the second file closes itself and returns to the first file, because the variables that were modified by the second file are not references to, but actually copy's of the original variables, meaning that they were no longer linked to the original variables. This renders the second script practically useless.

I know that call "file.batch" would run the second file in the same environment, which would fix the problem, but I want the second file to run in a separate window, which call "file.batch" doesn't.

Here's a quick demonstration of the problem:

File 1:

@echo off
set $var=0
echo before starting file 2: %$var%
start test02.bat
echo after starting file 2: %$var%
echo before calling file 2: %$var%
call test02.bat
echo after calling file 2: %$var%
pause&exit

File 2:

@echo off
echo inside file 2: %$var%
set $var=1
echo inside file 2: %$var%
exit /b 0

Output:

before starting file 2: 0

inside file 2: 0
inside file 2: 1

after starting file 2: 0
before calling file 2: 0
inside file 2: 0
inside file 2: 1
after calling file 2: 1

batch-file pass-by-reference

share|improve this question

edited Mar 22 at 13:59

double-beep

3,13641532

asked Mar 22 at 9:37

Lenard van der MaasLenard van der Maas

457

@echo off
set $var=0
echo before starting file 2: %$var%
start test02.bat
echo after starting file 2: %$var%
echo before calling file 2: %$var%
call test02.bat
echo after calling file 2: %$var%
pause&exit

@echo off
echo inside file 2: %$var%
set $var=1
echo inside file 2: %$var%
exit /b 0

before starting file 2: 0

inside file 2: 0
inside file 2: 1

after starting file 2: 0
before calling file 2: 0
inside file 2: 0
inside file 2: 1
after calling file 2: 1

share|improve this question

edited Mar 22 at 13:59

double-beep

3,13641532

asked Mar 22 at 9:37

Lenard van der MaasLenard van der Maas

457

share|improve this question

edited Mar 22 at 13:59

double-beep

3,13641532

asked Mar 22 at 9:37

Lenard van der MaasLenard van der Maas

457

edited Mar 22 at 13:59

double-beep

3,13641532

edited Mar 22 at 13:59

double-beep

3,13641532

asked Mar 22 at 9:37

Lenard van der MaasLenard van der Maas

457

asked Mar 22 at 9:37

Lenard van der MaasLenard van der Maas

457