создавать списки аргументов и вызывать утилиту (construct argument lists and invoke utility)
Стандартный вывод сообщений (Stderr)
The standard error shall be used for diagnostic messages and the
-t and -p options. If the -t option is specified, the utility and
its constructed argument list shall be written to standard error,
as it will be invoked, prior to invocation. If -p is specified, a
prompt of the following format shall be written (in the POSIX
locale):
"?..."
at the end of the line of the output from -t.
