Batch Files - Error Handling

Question

I m currently writing my first batch file for deploying an asp net solution  I ve been Googling a bit for a general error handling approach and can t find anything really useful   Basically if any thing goes wrong I want to stop and print out what went wrong   Can anyone give me any pointers

User · Answer

Using ERRORLEVEL when it s available is the easiest option  However  if you re calling an external program to perform some task  and it doesn t return proper codes  you can pipe the output to  find  and check the errorlevel from that   c  mypath myexe exe   find  ERROR   gt nul2 gt nul if not ERRORLEVEL 1   echo  Uh oh  something bad happened exit  b 1     Or to give more info about what happened  c  mypath myexe exe 2 amp 1 gt  myexe log find  Invalid File   myexe log   gt nul2 gt nul  amp  amp  echo Invalid File error in Myexe exe  amp  amp  exit  b 1 find  Error 0x12345678   myexe log   gt nul2 gt nul  amp  amp  echo Myexe exe was unable to contact server x  amp  amp  exit  b 1

User · Answer

Other than ERRORLEVEL  batch files have no error handling   You d want to look at a more powerful scripting language   I ve been moving code to PowerShell     The ability to easily use  Net assemblies and methods was one of the major reasons I started with PowerShell   The improved error handling was another   The fact that Microsoft is now requiring all of its server programs  Exchange  SQL Server etc  to be PowerShell drivable was pure icing on the cake     Right now  it looks like any time invested in learning and using PowerShell will be time well spent

User · Answer

I guess this feature was added since the OP but for future reference errors that would output in the command window can be redirected to a file independent of the standard output  command 1  file - Write the standard output of command to file  command 2  file - Write the standard error of command to file

User · Answer

Python Unittest  Bat process Error Codes   if   name         main        test suite   unittest TestSuite      test suite addTest RunTestCases  test aggregationCount 001       runner   unittest TextTestRunner      result   runner run test suite       result   unittest TextTestRunner   run test suite     if result wasSuccessful           print                  Test Successful                           sys exit 1     else         print                  Test Failed                           sys exit     Bat codes    echo off for  l   a in  1 1 2  do   testcase test py  amp  amp      echo Error found  Waiting here      pause          echo This time of test is ok

User · Answer

Its extremely easy  Create a file that contains   call  lt filename gt      the file you made cls echo An error occured   lt Your commands gt  pause   So now when you start it  it will launch your program as normal  But when anything goes wrong it exits and continues the script inside the first file  Now there you can put your own commands in

User · Answer

I generally find the conditional command concatenation operators much more convenient than ERRORLEVEL   yourCommand  amp  amp      echo yourCommand was successful          echo yourCommand failed     There is one complication you should be aware of  The error branch will fire if the last command in the success branch raises an error   yourCommand  amp  amp      someCommandThatMayFail          echo This will fire if yourCommand or someCommandThatMayFail raises an error     The fix is to insert a harmless command that is guaranteed to succeed at the end of the success branch  I like to use  call    which does nothing except set the ERRORLEVEL to 0  There is a corollary  call  that does nothing except set the ERRORLEVEL to 1   yourCommand  amp  amp      someCommandThatMayFail    call            echo This can only fire if yourCommand raises an error     See Foolproof way to check for nonzero  error  return code in windows batch file for examples of the intricacies needed when using ERRORLEVEL to detect errors

User · Answer

A successful ping on your local network can be trapped using ERRORLEVEL    ECHO OFF PING 10 0 0 123 IF ERRORLEVEL 1 GOTO NOT-THERE ECHO IP ADDRESS EXISTS PAUSE EXIT  NOT-THERE ECHO IP ADDRESS NOT NOT EXIST PAUSE EXIT

[batch-file] Batch Files - Error Handling

Examples related to batch-file