Execute UNIX operating system command.

  [status,result] = UNIX('command'), for UNIX systems, calls upon

  the operating system to execute the given command.  The resulting

  status and standard output are returned.






      [s,w] = unix('who')



  returns s = 0 and, in w, a MATLAB string containing a list of

  the users currently logged in.



      [s,w] = unix('why')



  returns a nonzero value in s to indicate failure and sets w to

  the null matrix because "why" is not a UNIX command.



      [s,m] = unix('matlab')



  never returns because running the second copy of MATLAB requires

  interactive user input which cannot be provided.



  See also ! (exclamation point) under PUNCT72EU0LG.