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 The "!" command is  provided to permit  a command to  be passed to  the
 operating system for execution, after which control returns to  RDINFO.
 This will not be available on all systems.  The text following the  "!"
 is not examined further; it is simply passed directly to the  operating
 system command  interpreter  for execution.   For  example, on  a  Unix
 system, for which this  command is trivial  to implement, typing  "!ls"
 will give a directory listing of the files in the current directory.