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A simple command is the kind of command encountered most often.
It's just a sequence of words separated by
by one of the shell's control operators (see section 2. Definitions). The
first word generally specifies a command to be executed, with the
rest of the words being that command's arguments.
The return status (see section 3.7.5 Exit Status) of a simple command is
its exit status as provided
by the POSIX 1003.1
waitpid function, or 128+n if
the command was terminated by signal n.