интерпретатор команд (оболочка) (command interpreter (shell))
Статус выхода (Exit)
Errors that are detected by the shell, such as a syntax error, will
cause the shell to exit with a non-zero exit status. If the shell
is not an interactive shell, the execution of the shell file will
be aborted. Otherwise the shell will return the exit status of the
last command executed, or if the exit builtin is used with a
numeric argument, it will return the argument.
