No worries, I'd rather have it twice than not at all :-) Thank you all for the helpful tipps. We ended up knowing a lot more about Haskell. The easiest solution however, was to compile it all into an application - tadaa, deleting works as wished for. Regards, Torsten Am 05.11.2009 um 02:00 schrieb Ben Millwood:

Oops, I clicked "reply" instead of "reply to all". Duplicating the message below. I suppose this means someone is going to get two copies of this. Sorry someone!

On Thu, Nov 5, 2009 at 12:56 AM, Ben Millwood wrote:

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On Wed, Nov 4, 2009 at 10:21 PM, Torsten Otto wrote:

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t <- getLine it is not possible to delete typos before hitting enter and thereby sending

When we read the user's input through the input off to the system (at least in OS X, bash). I didn't find that terribly problematic, but of course it is a bit of a show stopper from their point of view.

As people have said it's worth checking what buffering settings you are using (especially note that ghci changes some interesting settings in relation to how input is handled, and compiled code may behave differently), but it might also be worth checking the terminal application's preferences to see if there are settings related to the interpretation of the backspace key that you need to twiddle one way or the other. In particular, if you are finding that pressing delete makes ^H appear on the input line instead of deleting things, or if pressing ctrl-H deletes stuff where the delete key fails to do so, it might be a problem with your terminal rather than with your program. This is only based on what I vaguely remember from faffing with the Mac Terminal application some time ago when it wouldn't co-operate with screen, but it may be worth a look.

yours, Ben Millwood