$ sudo some_commandPassword:Sorry, try again.Sorry, try again.Sorry, try again.sudo: 3 incorrect password attempts$This is what my shell prints when I enter a wrong password to a sudoed command.Why could this happen?$ sudo -VSudo version 1.6.7p5$ uname -aLinux lazer 2.6.18-164.0.0.0.1.el5xen #1 SMP Thu Sep 3 00:34:43 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux$ 
Why does my sudo ask for password only once but evaluate thrice?
linux;sudo;password;authentication