Is there a typo corrector for bash?

I'd like for something to hook into the 'command not found' error on bash and offer a useful fix.

For example:

grep-C3  error
bash: grep-C3: command not found

It would be nice if it said:

Did you mean: grep -C3 error (Y/n)

I've seen people include common typos in the .bash_profile script like 'alias gerp=grep', but I figure someone has probably written a general extension to bash to fix this sort of thing.

Has anyone heard of such an extension?

I don't know of a general purpose one, but there is one for directory names:

$ shopt -s cdspell
$ cd /usr/ibn
/usr/bin
$ pwd
/usr/bin
$ cd /usr/shar/doc
/usr/share/doc

This is from the man page for Bash:

If the search is unsuccessful, the shell searches for a defined shell 
function named command_not_found_handle.  If that function exists, it is 
invoked with the original command and the original command's arguments  
as its arguments

It might be possible to use this to do what you want, but the code would be quite a challenge. By the way, Ubuntu, for example, uses this to display packages that contain the command that was not found with installation instructions (apt-get).

Looks like shopt would be a good start.

Also, it appears that zsh has typo correction built in.