History Expansion

To retrieve the last command replacing a certain pattern once:

% mv foo.c old/ # very silly example, I know...
% ^foo^bar
% mv bar.c old/

However if you need to replace all occurences, with zsh 4.3.1 you can use:

% mv foo.c foo_archive 
% ^foo^bar:G
% mv bar.c bar_archive

Another way to achieve the same global substitution is to use:

% r foo=bar

There's lot's of stuff to be done with substitution on history, read the section “HISTORY EXPANSION” on zsh's manual to learn more.