IBM AIX Question:

To login in:
Login id: <username>
Password: <the password does not appear>
To log out:
$ <ctrl+d> (or)
$ <exit> (or)
☛ AIX is designed as a multiuser system, a level of security is implemented to control access. Each user of the system has a user name and associated password (optional).
☛ If the user ID requires a password, the system will prompt for the password in a similar manner. While the user is typing a password, it does not appear on the screen.
☛ To terminate the session the user may either enter the exit or logout command, or press the key combination <Ctrl-d> (holding down the Ctrl key while pressing the d key.) logout only works if you are in your login shell.