Hiding your password when typed as an argument into a bash shell / command prompt?

I don't get much to know, by the details you provided, however I assume the question title itself makes all of it and will answer that :

Hiding your password when typed as an argument into a bash shell / command prompt ?

Being a linux user, I would answer it for bash shell. You can write a shell script that prompts for password like this.

#!/bin/bash
echo -n Password:    # Prompt for entering password 
read -s password     # read password by suppressing it using -s option
echo
echo $password       # print password

Here -s in read command means suppress that suppress the output stream to show anything. Thus having your password invisible when you type it.

NOTE : It works in a shell script, but to make it work in applications such as weechat, you have to change the underlying code or better write a shell script that does it when you open the app for the first time.

To read more on this topic follow this and this

Feel free to add-in more details.