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' in zshmisc(1).
