If Errorcode 0 Then .exit Error Code
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exit codes, exit codes are important and this article describes how to use them in your scripts and understand them shell script exit code in general. Written by Benjamin Cane on 2014-09-02 14:45:00| 4 min read
Bash If Exit Code
Sponsored by Lately I've been working on a lot of automation and monitoring projects, a big part of these
Bash If Exit Code Not 0
projects are taking existing scripts and modifying them to be useful for automation and monitoring tools. One thing I have noticed is sometimes scripts use exit codes and sometimes they
Unix Exit Codes
don't. It seems like exit codes are easy for poeple to forget, but they are an incredibly important part of any script. Especially if that script is used for the command line. What are exit codes? On Unix and Linux systems, programs can pass a value to their parent process while terminating. This value is referred to as an exit code exit bash shell or exit status. On POSIX systems the standard convention is for the program to pass 0 for successful executions and 1 or higher for failed executions. Why is this important? If you look at exit codes in the context of scripts written to be used for the command line the answer is very simple. Any script that is useful in some fashion will inevitably be either used in another script, or wrapped with a bash one liner. This becomes especially true if the script is used with automation tools like SaltStack or monitoring tools like Nagios, these programs will execute scripts and check the status code to determine whether that script was successful or not. On top of those reasons, exit codes exist within your scripts even if you don't define them. By not defining proper exit codes you could be falsely reporting successful executions which can cause issues depending on what the script does. What happens if I don't specify an exit code In Linux any script run from the command line has an exit code. With Bash scripts, if
and Signals and Traps (Oh My!) - Part 1 by William Shotts, Jr. In this lesson, we're going to look at handling errors during the execution of your scripts. The difference bash script exit on error between a good program and a poor one is often measured in bash set exit code terms of the program's robustness. That is, the program's ability to handle situations in which something goes wrong. Exit bash if not equal status As you recall from previous lessons, every well-written program returns an exit status when it finishes. If a program finishes successfully, the exit status will be zero. If the exit status http://bencane.com/2014/09/02/understanding-exit-codes-and-how-to-use-them-in-bash-scripts/ is anything other than zero, then the program failed in some way. It is very important to check the exit status of programs you call in your scripts. It is also important that your scripts return a meaningful exit status when they finish. I once had a Unix system administrator who wrote a script for a production system containing the following 2 lines http://linuxcommand.org/wss0150.php of code: # Example of a really bad idea cd $some_directory rm * Why is this such a bad way of doing it? It's not, if nothing goes wrong. The two lines change the working directory to the name contained in $some_directory and delete the files in that directory. That's the intended behavior. But what happens if the directory named in $some_directory doesn't exist? In that case, the cd command will fail and the script executes the rm command on the current working directory. Not the intended behavior! By the way, my hapless system administrator's script suffered this very failure and it destroyed a large portion of an important production system. Don't let this happen to you! The problem with the script was that it did not check the exit status of the cd command before proceeding with the rm command. Checking the exit status There are several ways you can get and respond to the exit status of a program. First, you can examine the contents of the $? environment variable. $? will contain the exit status of the last command executed. You can see
categoryThis boardKnowledge baseUsers turn on suggestions Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for Search instead for Did you mean: Teradata http://community.teradata.com/t5/Database/Bteq-script-error-handling-not-working-need-help/td-p/60502 : Product Forums : Database : Bteq script - error handling not working, http://www.computerhope.com/forum/index.php?topic=65815.0 need hel... Options Subscribe to RSS Feed Mark Topic as New Mark Topic as Read Float this Topic to the Top Bookmark Subscribe Printer Friendly Page bheemsen Fan Options Mark as New Bookmark Subscribe Subscribe to RSS Feed Get Direct Link Print Email to a Friend Report Inappropriate Content 03-21-2011 exit code 03:35 PM 03-21-2011 03:35 PM Bteq script - error handling not working, need help Hi,Can anyone tell me why my script below is not working? The error handling part is not working.bteq >> ../log/spend_analysis.log <.SET ERROROUT STDOUT.SET ERRORLEVEL 3807 SEVERITY 0.SET ERRORLEVEL UNKNOWN SEVERITY 16.SET FORMAT ON.run file=login.sqldatabase $dbname;.run file=spend_analysis.sql.IF ERRORCODE <> 0 THEN .GOTO SCRIPT_FAILED;.LOGOFF.EXIT 0.LABEL SCRIPT_FAILED.REMARK 'Errors occured while executing bash if exit the script.'update control_wh_logset status='FAILED',ended_at=cast(CURRENT_DATE as TimeStamp(0)) + ((CURRENT_TIME - time '00:00:00') hour to second(0));.LOGOFF.QUIT ERRORCODEEOFThe above script is supposed to fail and update the row in control_wh_log with FAILED status. Somehow it is not executing the following part of the script..LABEL SCRIPT_FAILED.REMARK 'Errors occured while executing the script.'update control_wh_logset status='FAILED',ended_at=cast(CURRENT_DATE as TimeStamp(0)) + ((CURRENT_TIME - time '00:00:00') hour to second(0));.LOGOFF.QUIT ERRORCODEI looked at the log file which has the following lines besides the information for other successful runs of the queries.*** Failure 6706 The string contains an untranslatable character. Statement# 1, Info =0*** Total elapsed time was 5 minutes and 52 seconds.+---------+---------+---------+---------+---------+---------+---------+---- *** You are now logged off from the DBC.+---------+---------+---------+---------+---------+---------+---------+---- *** Exiting BTEQ... *** RC (return code) = 16Am I missing anything here? Another thing is, the script is not logging the SQLs into the log file even though I had the line ".SET FORMAT ON".Any help is appreciated.Thanks 0 Kudos Reply All forum topics Previous Topic Next Topic 7 REPLIES kostek Enthusiast Options Mark as New Bookmark Subscribe Subscribe to RSS Feed Get Direct Link Print Email to a Friend Report Inappropriate Content 0
activation email? 1 Hour 1 Day 1 Week 1 Month Forever Login with username, password and session length Forum only search News: Home Help Login Register Computer Hope » Microsoft » Microsoft DOS » How to return success/failure from a batch file? « previous next » Print Pages: [1] Go Down Author Topic: How to return success/failure from a batch file? (Read 127505 times) 0 Members and 1 Guest are viewing this topic. greveszTopic StarterStarter How to return success/failure from a batch file? « on: September 09, 2008, 02:31:33 PM » Hello,I am new to the DOS world. Could someone please help with these questions:How do I return 0 for success ate the end of an MSDOS batch file?Similarly, how do I return 1 (or other values) representing erroneous execution?Thanks in advance!Gabor Logged diablo416Hopeful Re: How to return success/failure from a batch file? « Reply #1 on: September 09, 2008, 03:25:36 PM » heres an example@echo offsetlocal enabledelayedexpansionping 127.0.0.1 if "%errorlevel%"=="0" cls &Echo Success.if "%errorlevel%"=="1" cls &Echo Failendlocal Logged greveszTopic StarterStarter Re: How to return success/failure from a batch file? « Reply #2 on: September 09, 2008, 04:20:08 PM » Thanks, but that's not exactly what I had in mind. Let me try to explain it in a different way:a.bat calls b.bat and when b.bat completes, a.bat continues with steps depending on whether b.bat succeeded or failed.a.bat:Code: [Select]rem some code here
call b.bat
if "%errorlevel%=="0" goto success
:failure
rem do something
goto end
:success
rem do something else
:endWhat would b.bat look like for a.bat to work?Thanks again!Gabor Logged fireballsApprentice Code:TerminalThanked: 3 Re: How to return success/failure from a batch file? « Reply #3 on: September 09, 2008, 04:23:57 PM » If one of b.bat's commands fails because of an e