I'm going through my book on bash and have come to a section on Shell Variables. The editing mode variables don't seem to be there, unless I'm missing something. It says no manual entry for them -- commands like HISTCMD, HISTCONTROL, HISTIGNORE, HISTFILE, HISTFILESIZE, HISTSIZE, HISTTIMEFORMAT, and FCEDIT.
I think I'm not understanding something, but I'm not sure what. Can someone help me out?