return returns from the current function; it’s a language keyword like for or break. exit() terminates the whole program, wherever you call it from. (After flushing stdio buffers and so on). The only case when both do (nearly) the same thing is in the main() function, as a return from main performs an exit(). In … Read more
From the documentation: system returns true if the command gives zero exit status, false for non zero exit status. Returns nil if command execution fails. system(“unknown command”) #=> nil system(“echo foo”) #=> true system(“echo foo | grep bar”) #=> false Furthermore An error status is available in $?. system(“VBoxManage createvm –invalid-option”) $? #=> #<Process::Status: pid … Read more
Try to follow the advice you see on the screen, and first reset your master’s HEAD to the commit it expects. git update-ref refs/heads/master b918ac16a33881ce00799bea63d9c23bf7022d67 Then, abort the rebase again.
First of all, whenever you have a “how it is used in practice” question, a good way to start is to search the Go source code (or any big enough Go code base, really), and the package docs for answers. Now, os.Exit and panic are quite different. panic is used when the program, or its … Read more
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 … Read more
QApplication is derived from QCoreApplication and thereby inherits quit() which is a public slot of QCoreApplication, so there is no difference between QApplication::quit() and QCoreApplication::quit(). As we can read in the documentation of QCoreApplication::quit() it “tells the application to exit with return code 0 (success).”. If you want to exit because you discovered file corruption … Read more
Others have mentioned docker logs $container_id to view the output of the application. This would always be my first thing to check. Next, you can run a docker inspect $container_id to view details on the state, e.g.: “State”: { “Status”: “exited”, “Running”: false, “Paused”: false, “Restarting”: false, “OOMKilled”: false, “Dead”: false, “Pid”: 0, “ExitCode”: 2, … Read more
Check out the atexit module: http://docs.python.org/library/atexit.html For example, if I wanted to print a message when my application was terminating: import atexit def exit_handler(): print ‘My application is ending!’ atexit.register(exit_handler) Just be aware that this works great for normal termination of the script, but it won’t get called in all cases (e.g. fatal internal errors).
Use: return [n] From help return return: return [n] Return from a shell function. Causes a function or sourced script to exit with the return value specified by N. If N is omitted, the return status is that of the last command executed within the function or script. Exit Status: Returns N, or failure if … Read more
If you put set -e in a script, the script will terminate as soon as any command inside it fails (i.e. as soon as any command returns a nonzero status). This doesn’t let you write your own message, but often the failing command’s own messages are enough. The advantage of this approach is that it’s … Read more