command [ -pvV ] simple command
       The simple command argument is taken as an external
       command  instead  of  a  function or builtin and is
       executed. If  the  POSIX BUILTINS  option  is  set,
       builtins  will also be executed but certain special
       properties of them  are  suppressed.  The  -p  flag
       causes  a  default  path  to be searched instead of
       that in $path. With the -v flag, command is similar
       to  whence  and with -V, it is equivalent to whence
       -v.

       See also the section `Precommand Modifiers'.
