HIST_FIND_NO_DUPS When searching for history entries in the line editor, do not display duplicates of a line previously found, even if the duplicates are not contiguous.
Sin embargo, cuando uso Ctrl-p repetidamente, aparece el mismo comando.
$ ls
$ pwd
$ ls
$ <Ctrl-p> => ls
<Ctrl-p> => pwd
<Ctrl-p> => ls again!
zsh 5.0.5 (x86_64-apple-darwin14.0)