[Haskell-cafe] Disable echo in POSIX terminal

Thomas Schilling nominolo at googlemail.com
Fri Nov 9 11:20:07 EST 2007

On Fri, 2007-11-09 at 10:59 -0500, Taylor Venable wrote:
> Hello all,
> I've written a little Haskell program to get information from a MySQL
> database (great thanks to anybody reading this who works on HSQL, by
> the way) but I want to keep the user's password concealed, obviously.
> Currently I prompt for it from the terminal, but the problem is that
> it's echoed just like all other input.  I would like to disable input
> echo when asking for the password, but I'm not sure how.  I notice
> there's a System.POSIX.Terminal module, but I have no idea how to use
> it, or whether it will do what I want.  Any ideas would be greatly
> appreciated.
> Best regards.

In C you usually use:  getpasswd

I cannot find it System.Posix, so you might have to write your own FFI
bindings.  Otherwise, you can play around with the terminal modes from:


Good luck!

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