Check if process returns 0 with batch file

Question

I want to start a process with a batch file and if it returns nonzero  do something else  I need the correct syntax for that   Something like this     x bat   set RetCode My exe  if  retcode  is nonzero    handleError exe   As a bonus  you may consider answering the following questions  please      How to write a compound statement with if  If the application My exe fails to start because some DLL is missing will my if work  If not  how can I detect that My exe failed to start

User · Answer

The project I m working on  we do something like this   We use the errorlevel keyword so it kind of looks like   call myExe exe if errorlevel 1     goto build fail     That seems to work for us   Note that you can put in multiple commands in the parens like an echo or whatever   Also note that build fail is defined as    build fail echo            BUILD FAILURE            exit  b 1

User · Answer

ERRORLEVEL will contain the return code of the last command  Sadly you can only check  gt   for it    Note specifically this line in the MSDN documentation for the If statement      errorlevel Number      Specifies a true   condition only if the previous program   run by Cmd exe returned an exit code   equal to or greater than Number    So to check for 0 you need to think outside the box   IF ERRORLEVEL 1 GOTO errorHandling REM no error here  errolevel    0  errorHandling   Or if you want to code error handling first   IF NOT ERRORLEVEL 1 GOTO no error REM errorhandling  errorlevel  gt   1  no error   Further information about BAT programming  http   www ericphelps com batch  Or more specific for Windows cmd  MSDN using batch files

User · Answer

This is not exactly the answer to the question  but I end up here every time I want to find out how to get my batch file to exit with and error code when a process returns an nonzero code    So here is the answer to that   if  ERRORLEVEL  NEQ 0 exit  ERRORLEVEL

User · Answer

To check whether a process command returned 0 or not  use the operators  amp  amp     0  or  not    0      Just add operator to your script  execute command              echo Return 0  with no execution error                echo Return non 0  something went wrong         command    echo Return 0    echo Return non 0  For details on Operators  behavior see  Conditional Execution     amp  amp

User · Answer

How to write a compound statement with   if    You can write a compound statement in an if block using parenthesis   The first parenthesis must come on the line with the if and the second on a line by itself   if  ERRORLEVEL     0       echo ErrorLevel is zero     echo A second statement   else if  ERRORLEVEL     1       echo ErrorLevel is one     echo A second statement   else      echo ErrorLevel is  gt  1    echo A second statement

User · Answer

You can use below command to check if it returns 0 or 1     In below example  I am checking for the string in the one particular file which will give you 1 if that particular word  Error  is not present in the file and if present then 0   find  i    ERROR1    C  myfile txt echo  errorlevel   if  errorlevel  equ 1 goto notfound goto found  notfound exit 1  found echo we found the text

[windows] Check if process returns 0 with batch file

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