Z-Shell does not automatically know which possible switches binary files work with. To my knowledge, there is no standard way for a shell.
ZSH , . , zsh ssh, cvs, git, ls ..
, . zsh, echo $fpath, function path, zsh . /usr/local/share/zsh/4.3.17/function ( /zsh ), , _ - _ssh, _cvs .. .
, , _ssh, 4.3.17 ( ):
Z-: fpath
, zsh . Z-Shell - fpath.