completion

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

Gentlemen:

I'm trying to get command line completion to only offer me lines that 
are an exact match for what has already been typed.  The number of 
things you can set in .zshrc is a bit overwhelming. I have all this just 
for 'completion' and I confess I have little idea what does what:

zstyle ':completion:*' matcher-list 'm:{a-zA-Z}={A-Za-z}'
zstyle ':completion:*:killall:*' command 'ps -u $USER -o cmd'
zstyle ':completion:*' menu select
zstyle ':completion:*' completer _complete _match _approximate
zstyle ':completion:*:match:*' original only
zstyle ':completion:*:approximate:*' max-errors 1 numeric
zstyle ':completion:*:*:kill:*' menu yes select
zstyle ':completion:*:kill:*' force-list always
zstyle ':completion:*:cd:*' ignore-parents parent pwd

Can anyone rationalize all that?  I'm going to hack away at it blindly 
in the mean time, but some fatherly advice would be apreciated.

Tx.