создавать списки аргументов и вызывать утилиту (construct argument lists and invoke utility)
Операнды (Operands)
The following operands shall be supported:
utility The name of the utility to be invoked, found by search
path using the PATH environment variable, described in
the Base Definitions volume of POSIX.1‐2017, Chapter 8,
Environment Variables. If utility is omitted, the
default shall be the echo utility. If the utility
operand names any of the special built-in utilities in
Section 2.14, Special Built-In Utilities, the results
are undefined.
argument An initial option or operand for the invocation of
utility.
