Linux Terminal – Clear Mistyped Invisible Password on Shell

You can use tput reset.

Besides reset and tput reset you can use following shell script.

#!/bin/sh
echo -e \\033c

This sends control characters Esc-C to the console which resets the terminal.

Google Keywords: Linux Console Control Sequences

man console_codes says:

The sequence ESC c causes a terminal reset, which is what you want if the screen is all garbled. The oft-advised "echo ^V^O" will only make G0 current, but there is no guarantee that G0 points at table a). In some distributions there is a program reset(1) that just does "echo ^[c". If your terminfo entry for the console is correct (and has an entry rs1=\Ec), then "tput reset" will also work.

Typing the Ctrl-U key combination will, in most cases¹, erase the entire line of input even if echo is turned off.

[1] Some programs put the terminal device into "raw" mode, where every character you type is sent to the program. Emacs is one example. They may have their own conventions for character erase/line kill processing.