exit

Is there a way to write a bash function which aborts the whole execution, no matter how it is called?

由 ☆樱花仙子☆ 提交于 2019-11-26 12:36:59
问题 I was using \"exit 1\" statement in my bash functions to terminate the whole script and it worked fine: function func() { echo \"Goodbye\" exit 1 } echo \"Function call will abort\" func echo \"This will never be printed\" But then I realized that it doesn\'t do the work when called like: res=$(func) I understand that I created a subshell and \"exit 1\" aborts that subshell and not the primary one.... But is there a way to write a function which aborts the whole execution, no matter how it is

Difference between exit() and sys.exit() in Python

由 ￡可爱￡侵袭症＋ 提交于 2019-11-26 11:58:46
In Python, there are two similarly-named functions, exit() and sys.exit() . What's the difference and when should I use one over the other? exit is a helper for the interactive shell - sys.exit is intended for use in programs. The site module (which is imported automatically during startup, except if the -S command-line option is given) adds several constants to the built-in namespace (e.g. exit ) . They are useful for the interactive interpreter shell and should not be used in programs . Technically, they do mostly the same: raising SystemExit . sys.exit does so in sysmodule.c : static

How do I abort the execution of a Python script? [duplicate]

由 家住魔仙堡 提交于 2019-11-26 11:58:32
问题 Possible Duplicate: Terminating a Python script I have a simple Python script that I want to stop executing if a condition is met. For example: done = True if done: # quit/stop/exit else: # do other stuff Essentially, I am looking for something that behaves equivalently to the \'return\' keyword in the body of a function which allows the flow of the code to exit the function and not execute the remaining code. 回答1: To exit a script you can use, import sys sys.exit() You can also provide an

How to exit if a command failed?

由 随声附和 提交于 2019-11-26 11:47:19
问题 I am a noob in shell-scripting. I want to print a message and exit my script if a command fails. I\'ve tried: my_command && (echo \'my_command failed; exit) but it does not work. It keeps executing the instructions following this line in the script. I\'m using Ubuntu and bash. 回答1: Try: my_command || { echo 'my_command failed' ; exit 1; } Four changes: Change && to || Use { } in place of ( ) Introduce ; after exit and spaces after { and before } Since you want to print the message and exit

Will exit() or an exception prevent an end-of-scope destructor from being called?

由 ╄→гoц情女王★ 提交于 2019-11-26 11:29:02
问题 Let\'s say I have the following code: struct mytype { ~mytype() { /* do something like call Mix_CloseAudio etc */ } }; int main() { mytype instant; init_stuff(); start(); return 0; } Is that destructor guaranteed to be called even if exit() is used from somewhere inside start() ? 回答1: If you call exit , the destructor will not be called. From the C++ standard (§3.6.1/4): Calling the function void exit(int); declared in <cstdlib> (18.3) terminates the program without leaving the current block

Automatic exit from bash shell script on error

由 时光怂恿深爱的人放手 提交于 2019-11-26 11:28:18
I've been writing some shell script and I would find it useful if there was the ability to halt the execution of said shell script if any of the commands failed. See below for an example: #!/bin/bash cd some_dir ./configure --some-flags make make install So in this case if the script can't change to the indicated directory then it would certainly not want to do a ./configure afterwards if it fails. Now I'm well aware that I could have an if check for each command (which I think is a hopeless solution), but is there a global setting to make the script exit if one of the commands fails? Adam

What is the difference between using _exit() & exit() in a conventional Linux fork-exec?

由 坚强是说给别人听的谎言 提交于 2019-11-26 10:30:36
问题 I\'ve been trying to figure out how the fork-exec mechanism is used inside Linux. Everything was going on according to the plan until some web pages started to confuse me. It is said that a child process should strictly use _exit() instead of a simple exit() or a normal return from main() . As I know, Linux shell fork-execs every one of the external commands; assuming what I said above is true, the conclusion is that none of these external commands nor any other execution happening inside the

What is the command to exit a Console application in C#?

由 隐身守侯 提交于 2019-11-26 10:14:59
问题 What is the command in C# for exit a Console Application? 回答1: You can use Environment.Exit(0); and Application.Exit Environment.Exit(0) is cleaner. 回答2: Several options, by order of most appropriate way: Return an int from the Program.Main method Throw an exception and don't handle it anywhere (use for unexpected error situations) To force termination elsewhere, System.Environment.Exit ( not portable! see below ) Edited 9/2013 to improve readability Returning with a specific exit code: As

What is the difference between exit() and abort()?

由 若如初见. 提交于 2019-11-26 10:06:44
问题 In C and C++, what is the difference between exit() and abort() ? I am trying to end my program after an error (not an exception). 回答1: abort() exits your program without calling functions registered using atexit() first, and without calling objects' destructors first. exit() does both before exiting your program. It does not call destructors for automatic objects though. So A a; void test() { static A b; A c; exit(0); } Will destruct a and b properly, but will not call destructors of c .

What are the differences in die() and exit() in PHP?

由 ﹥＞﹥吖頭↗ 提交于 2019-11-26 09:41:48
What are the differences between die() and exit() functions in PHP? I think both have the same functionality, but I doubt there is something different in both... what is it? There's no difference - they are the same. PHP Manual for exit : Note: This language construct is equivalent to die() . PHP Manual for die : This language construct is equivalent to exit() . DIFFERENCE IN ORIGIN The difference between die() and exit() in PHP is their origin . exit() is from exit() in C . die() is from die in Perl . FUNCTIONALLY EQUIVALENT die() and exit() are equivalent functions. PHP Manual PHP Manual for
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