Program Return Error Codes
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The exit command terminates a script, just as in a C program. It can also return a value, which is available to the exit status linux script's parent process.Every command returns an exit status (sometimes referredExit Codes Linux
to as a return status or exit code). A successful command returns a 0, while exit status c an unsuccessful one returns a non-zero value that usually can be interpreted as an error code. Well-behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there
Exit Code Python
are some exceptions.
Likewise, functions within a script and the script itself return an exit status. The last command executed in the function or script determines the exit status. Within a script, an exit nnn command may be used to deliver an nnn exit status to the shell (nnn must be an integer in the 0 windows exit code - 255 range).When a script ends with an exit that has no parameter, the exit status of the script is the exit status of the last command executed in the script (previous to the exit).#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exitThe equivalent of a bare exit is exit $? or even just omitting the exit.#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit $?#!/bin/bash COMMAND1 . . . COMMAND_LAST # Will exit with status of last command.C - Basic Syntax C - Data Types C - Variables C - Constants C - Storage Classes C - Operators C - Decision Making C - Loops C - Functions C - Scope Rules C - Arrays C - Pointers C - Strings C
Posix Exit Codes
- Structures C - Unions C - Bit Fields C - Typedef C - Input & Output
Exit Code Java
C - File I/O C - Preprocessors C - Header Files C - Type Casting C - Error Handling C - Recursion C - process exit code 1 Variable Arguments C - Memory Management C - Command Line Arguments C Programming Resources C - Questions & Answers C - Quick Guide C - Useful Resources C - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing http://www.tldp.org/LDP/abs/html/exit-status.html HR Interview Questions Computer Glossary Who is Who C - Error Handling Advertisements Previous Page Next Page As such, C programming does not provide direct support for error handling but being a system programming language, it provides you access at lower level in the form of return values. Most of the C or even Unix function calls return -1 or NULL in case of any error and set an error code errno. It is set as a global variable and indicates an https://www.tutorialspoint.com/cprogramming/c_error_handling.htm error occurred during any function call. You can find various error codes defined in
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads http://stackoverflow.com/questions/155610/how-do-i-specify-the-exit-code-of-a-console-application-in-net with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html up How do I specify the exit code of a console application in .NET? up vote 294 down vote favorite 37 I have a trivial console application in .NET. It's just a test part of a larger application. I'd like to exit code specify the "exit code" of my console application. How do I do this? c# .net exit-code share|improve this question edited Nov 20 '13 at 15:31 Peter Mortensen 10.3k1369107 asked Sep 30 '08 at 23:45 MrDatabase 11.8k3191145 add a comment| 11 Answers 11 active oldest votes up vote 397 down vote accepted You can return it from Main if you declare your Main method to return int, or call Environment.Exit(code). share|improve this answer edited Feb 3 '15 at 11:40 Cristian Ciupitu 10k32945 answered Sep 30 program return error '08 at 23:47 TheSoftwareJedi 20.7k1881129 6 For those of you who wonder why this does not work in their case, make sure your project is compiled as a "Console application" and not as a "Windows application". –Marcel Gosselin Apr 7 '12 at 4:11 7 what if I have a WinForms app that with some args I want it to behave as a console app? –sebagomez Sep 7 '12 at 16:27 4 You can also just type the maine program as int (replace void by int) and use e.g. "return -1;" to return from the main program. This is more portable than Environment.Exit() (which depends on the environment). –werner Jun 6 '13 at 11:27 8 @DannyBeckett By convention, an exit code of 0 means success, and non-zero means failure. return; indicates success through exit code 0, and return -1; indicates failure. –allonhadaya Nov 20 '13 at 15:42 1 You can also set the exit code using properties: Environment.ExitCode = -1; –t3b4n Aug 31 at 19:10 | show 3 more comments up vote 184 down vote In addition to the answers covering the return int's... a plea for sanity. Please, please define your exit codes in an enum, with Flags if appropriate. It makes debugging and maintenance so much easier (and, as a bonus, you can easily print out the exit codes on your help screen - you do have one of those, right?). enum ExitCode : int { Success = 0, InvalidLogin = 1,
stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8 – Parsing Input Part 9 – Logging Part 10 – Advanced Tricks Today we’ll cover return codes as the right way to communicate the outcome of your script’s execution to the world. Sadly, even skilled Windows programmers overlook the importance of return codes. Return Code Conventions By convention, command line execution should return zero when execution succeeds and non-zero when execution fails. Warning messages typically don’t effect the return code. What matters is did the script work or not? Checking Return Codes In Your Script Commands The environmental variable %ERRORLEVEL% contains the return code of the last executed program or script. A very helpful feature is the built-in DOS commands like ECHO, IF, and SET will preserve the existing value of %ERRORLEVEL%. The conventional technique to check for a non-zero return code using the NEQ (Not-Equal-To) operator of the IF command: IF %ERRORLEVEL% NEQ 0 ( REM do something here to address the error ) Another common technique is: IF ERRORLEVEL 1 ( REM do something here to address the error ) The ERRORLEVEL 1 statement is true when the return code is any number equal to or greater than 1. However, I don’t use this technique because programs can return negative numbers as well as positive numbers. Most programs rarely document every possible return code, so I’d rather explicity check for non-zero with the NEQ 0 style than assuming return codes will be 1 or greater on error. You may also want to check for specific error codes. For example, you can test that an executable program or script is in your PATH by simply calling the program and checking for return code 9009. SomeFile.exe IF %ERRORLEVEL% EQU 9009 ( ECHO error - SomeFile.exe not found in your PATH ) It’s hard to know this stuff upfront – I generally just use trial and error to figure out the best