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
0 and 1 are the exit codes. exit(0) means a clean exit without any errors / problems exit(1) means there was some issue / error / problem and that is why the program is exiting. This is not Python specific and is pretty common. A non-zero exit code is treated as an abnormal exit, and … Read more
You’re looking for calls to sys.exit() in the script. The argument to that method is returned to the environment as the exit code. It’s fairly likely that the script is never calling the exit method, and that 0 is the default exit code.
Part 1: Advanced Bash Scripting Guide As always, the Advanced Bash Scripting Guide has great information: (This was linked in another answer, but to a non-canonical URL.) 1: Catchall for general errors 2: Misuse of shell builtins (according to Bash documentation) 126: Command invoked cannot execute 127: “command not found” 128: Invalid argument to exit … Read more
Every command that runs has an exit status. That check is looking at the exit status of the command that finished most recently before that line runs. If you want your script to exit when that test returns true (the previous command failed) then you put exit 1 (or whatever) inside that if block after … Read more
Three options: You can return it from Main if you declare your Main method to return int. You can call Environment.Exit(code). You can set the exit code using properties: Environment.ExitCode = -1;. This will be used if nothing else sets the return code or uses one of the other options above). Depending on your application … Read more
Try this statement: exit 1 Replace 1 with appropriate error codes. See also Exit Codes With Special Meanings.
A pseudo environment variable named errorlevel stores the exit code: echo Exit Code is %errorlevel% Also, the if command has a special syntax: if errorlevel See if /? for details. Example @echo off my_nify_exe.exe if errorlevel 1 ( echo Failure Reason Given is %errorlevel% exit /b %errorlevel% ) Warning: If you set an environment variable … Read more