Version 4 of Echo-free password entry

Updated 2001-10-17 19:13:21

"What can I do so the characters can't be seen when a user types a password?" is a frequent question. Tk applications have a complete and simple answer: use entry's -show option.

A pure-Tcl solution is slightly subtler. In a Unix context, the formula is

        exec stty -echo / echo

[elaborate, including signal hygiene ...--which Expect handles by itself]