Note that Ctrl-Alt-E in
bash does not only expand aliases. It also expands variables, command substitution (!), process substitution (!), arithmetic expand and removes quotes (it doesn't do filename generation (globbing) or tilde expansion).
It doesn't always manage to expand aliases. So while it has its uses, it's important to realise its outcome potentially changes the meaning of the command line, has side effects and is potentially dangerous.
For instance in:
$ a=';w' b=1
$ alias foo=bar
$ b=2; echo $b $a; cd /tmp/dir && for i do foo $(pwd) <(ls); done
If I press
M-C-E here, that gives me:
$ b=2; echo 1 ;w; cd /tmp/dir && for i do foo / /dev/fd/63; done
Which gives me a completely different command line altogether (and imagine what would have happened if I had had
rm -rf * instead of
pwd above) and doesn't expand the
zsh, to build up on Gilles' note on aliases expanded inside functions, you could do:
zle -N expand-aliases
bindkey '\e^E' expand-aliases
That will expand the aliases only if the current command line is syntactically valid (so it doubles as a syntax checker).
bash's M-C-E, it also resolves the aliases fully. For instance if you have:
$ alias ll='ls -l'; alias ls='ls --color'
Will be expanded to:
$ ls --color -l
Note that it also canonicalises the syntax so things like:
$ for i (*) cmd $i; foo
will be changed to:
$ for i in *