hide password typing

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How to hide password on Linux?

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dialups

dialups(4)							   File Formats 							dialups(4)

NAME

       dialups - list of terminal devices requiring a dial-up password

SYNOPSIS

       /etc/dialups

DESCRIPTION

       dialups	is  an	ASCII file which contains a list of terminal devices  that require a dial-up password. A dial-up password is an additional
       password required of users who access the computer through a modem or dial-up port.  The correct password must be entered before  the  user
       is granted access to the computer. The set of ports that require a dial-up password are	listed in the dialups file.

       Each entry in the dialups file is a single line of the form:

	      terminal-device

       where

       terminal-device	       The  full  path	name  of the terminal device that will require a dial-up password for users accessing the computer
			       through a modem or dial-up port.

       The dialups file should be owned by the root user and the root group.  The file should have read and write permissions for the owner (root)
       only.

EXAMPLES

       Example 1: A sample dialups file.

       Here is a sample dialups file:

       /dev/term/a
       /dev/term/b
       /dev/term/c

FILES

       /etc/d_passwd	       dial-up password file

       /etc/dialups	       list of dial-up ports requiring dial-up passwords

SEE ALSO

       d_passwd(4)

SunOS 5.10							    4 May 1994								dialups(4)

Programming