выполнять команды позже (execute commands at a later time)
Стандартный вывод сообщений (Stderr)
In the POSIX locale, the following shall be written to standard
error when a job has been successfully submitted:
"job %s at %s\n", at_job_id, <date>
where date has the same format as that described in the STDOUT
section. Neither this, nor warning messages concerning the
selection of the command interpreter, shall be considered a
diagnostic that changes the exit status.
Diagnostic messages, if any, shall be written to standard error.
