bash uses GNU readline, while ZSH has it's own readline. IIRC the Emacs-/Vi-modes in bash are support from readline. (this is also why you configure some of the

bash uses GNU readline, while ZSH has it's own readline. IIRC the Emacs-/Vi-modes in bash are support from readline. (this is also why you configure some of these things via .inputrc for Bash rather than .bashrc).