Class yii\console\ExitCode

This class provides constants for defining console command exit codes.

The exit codes follow the codes defined in the FreeBSD sysexits(3) manual page.

These constants can be used in console controllers for example like this:

public function actionIndex()
{
    if (!$this->isAllowedToPerformAction()) {
         $this->stderr('Error: ' . ExitCode::getReason(ExitCode::NOPERM));
         return ExitCode::NOPERM;
    }

    // do something

    return ExitCode::OK;
}

See also http://man.openbsd.org/sysexits.