GNU Readline, for those who doesn't know, also comes with vi mode, where you can search with '/' and '?' keys. You can enable it with 'set -o vi' in bash shell or putting 'set editing-mode vi' it in ~/.inputrc.

If you put it in ~/.inputrc, you will get vi mode in all tools/shells which are using Readline like mysql, rlwrap, psql...

https://github.com/pkrumins/bash-vi-editing-mode-cheat-sheet...