A simple command is the kind of command encountered most often.
It's just a sequence of words separated by blanks, terminated
by one of the shell's control operators (see section Definitions). The
first word generally specifies a command to be executed.
The return status (see section Exit Status) of a simple command is
its exit status as provided
by the POSIX.1 waitpid function, or 128+n if the command
was terminated by signal n.
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