How to get the content of a DOS variable?

rondbleu Posted messages 30 Registration date Status Member -
Jef - 24 Jun 2010 at 16:07

Hello,

I'm calling on the old-timers... I need to retrieve the content of the system variable errorlevel under DOS and I can't remember how to do it.
If someone could help me quickly...
Thanks in advance,
Rondbleu

4 answers

Answer 1 / 4

Best answer
The best answer is the one that has been validated by our teams.
Jef

Response:
echo %errorlevel%

Or echo %errorlevel% > Variable.txt
To write it to Variable.txt

Jef
3
Answer 2 / 4
ipl Posted messages 5738 Status Security Contributor 585

>>> Correspondences of values assigned to errorlevel!

The errorlevels are the responses returned by the "queried software"... what is your software?
0
1. rondbleu Posted messages 30 Registration date Status Member 5
  
  This is the one I support (I do technical support) and indeed, someone is complaining that the errorlevel value is always 0. However, when I test it, I get 9009!
  I'll keep looking...
  Thank you very much for your help everyone.
  
  0
  1. _jeune_padawan_ Posted messages 2660 Status Member 11 > rondbleu Posted messages 30 Registration date Status Member
    
    just a little clarification.....
    
    the errorlevel variable should not be changed manually (not even in a bat) because otherwise it won't return anything afterwards......
    
    only the system should change it....
    when errorlevel is different from 0 it means there was an error.....
    
    only zero indicates proper functioning!!!
    
    donotadventurersunderDOS!
    
    0
  2. rondbleu > _jeune_padawan_ Posted messages 2660 Status Member
    
    I also believe that this variable contains the value of the last executed "process". It seems that multiple programs can update this variable. Therefore, we need to quickly retrieve the value inserted by the software we want to "examine".
    In any case, your help has allowed me to get out of this call. Thank you all.
    Just a little response to "padaventuriersousDOS", it has been ages since I last used such commands but I swear on the bible (of DOS of course) that I did such things a few years ago ;-o
    THANK YOU THANK YOU THANK YOU THANK YOU THANK YOU THANK YOU THANK YOU
    
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Answer 3 / 4
ipl Posted messages 5738 Status Security Contributor 585

I'm responding to some old posts:
_young_padawan_ (05/11 at 15:54 GMT+1)
in a bat you shouldn't put quotes .... otherwise it won't work ;-p
pad'quotes ....

System Admin : (31/10 at 16:59 GMT+1)
IF "%ERRORLEVEL%" == "1" goto full
IF "%ERRORLEVEL%" == "0" goto broot
:full
echo "it works"
goto FIN

:broot
echo "F***ING HELL IT CRASHES"
goto FIN
:FIN
-----
Quotes in ECHO are unnecessary and will be displayed on the screen!
Quotes in IF "%ERRORLEVEL%" == "1" are unnecessary, at least in this form (enclosed); it's good to put some sign in case the tested variable is empty or non-existent
The % signs are unnecessary in the case of errorlevel.

if errorlevel "==1" is a good habit
or even better if there is a long series of tests
if errorlevel "==" goto absent
if errorlevel == 1 goto 1
etc.

because if the variable is empty, the test would become if ==1 and Dos doesn't like that!

P.S. :
The % signs should be used in the case of parameters passed on the command line... %1
or in the case of a variable from the "communication region" like %WINDIR% (perhaps created by the .bat)
or in the case of a loop variable.

There, I've said everything!
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Answer 4 / 4
batmat

Under Linux, to know the content of an environment variable, you use:
echo $NOMVARIABLE
it seems to be the same or similar under DOS
@+
-1
1. rondbleu Posted messages 30 Registration date Status Member 5
  
  Thank you for responding. Unfortunately, I know this is something close but I can't remember. I tested:
  - echo %errorlevel => result: %errorlevel
  - echo $errorlevel => result: $errorlevel
  - echo errorlevel => result: errorlevel
  - print .... => can't find the file specified
  
  ....
  
  I'm cracking and looking on the internet but can't find it!
  Thank you anyway,
  Rondbleu
  
  0
2. system admin > rondbleu Posted messages 30 Registration date Status Member
  
  if you are in a bat
  you do echo "%ERRORLEVEL%"
  or something to test
  IF "%ERRORLEVEL%" == "1" goto full
  IF "%ERRORLEVEL%" == "0" goto broot
  :full
  echo "it works"
  goto END
  
  :broot
  echo "FUCK SHIT IT CRASHES"
  goto END
  :END
  
  0
3. rondbleu Posted messages 30 Registration date Status Member 5 > system admin
  
  Yahoooo! It works! Thank you, it's only the second % that I was missing!
  
  0
4. system admin > rondbleu Posted messages 30 Registration date Status Member
  
  You see I'm good after all.
  Here's a thing
  to assign a value to a variable based on a result
  for example under Unix you do:
  a command generates the result in a text file toto.txt
  I do
  set NAME=`cat toto.txt`
  my variable NAME is equal to the result of the command cat toto.txt
  cat is like type under DOS.
  but under DOS I'm a bit in trouble so here’s how I do it in .bat
  FOR /F %%i in (toto.txt) do set NAME=%%i
  it's useful, right?
  PS: see the help for for and set.
  
  0
5. rondbleu Posted messages 30 Registration date Status Member 5 > system admin
  
  I must say that you are AMAZING. This has helped me make some progress on my test. I am now looking for the corresponding values assigned to errorlevel!
  In any case, I thank you very much.
  Rondbleu
  
  0

How to get the content of a DOS variable?

4 answers

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