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(bashref.info)Simple Commands

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Simple Commands
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   A simple command is the kind of command encountered most often.
It's just a sequence of words separated by `blank's, terminated by one
of the shell's control operators (Note: 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 (Note: 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.