mkpasswd man page
mkpasswd — generate new password, optionally apply it to a user
mkpasswd [ args ] [ user ]
mkpasswd generates passwords and can apply them automatically to users. mkpasswd is based on the code from Chapter 23 of the O'Reilly book "Exploring Expect".
With no arguments, mkpasswd returns a new password.
With a user name, mkpasswd assigns a new password to the user.
The passwords are randomly generated according to the flags below.
The -l flag defines the length of the password. The default is 9. The following example creates a 20 character password.
mkpasswd -l 20
The -d flag defines the number of digits that must be in the password. The default is 2. The following example creates a password with 3 digits.
mkpasswd -d 3
The -c flag defines the minimum number of lowercase alphabetic characters that must be in the password. The default is 2.
The -C flag defines the number of uppercase alphabetic characters that must be in the password. The default is 2.
The -s flag defines the number of special characters that must be in the password. The default is 1.
The -p flag names a program to set the password. By default, /etc/yppasswd is used if present, otherwise /bin/passwd is used.
The -2 flag causes characters to be chosen so that they alternate between right and left hands (qwerty-style), making it harder for anyone watching passwords being entered. This can also make it easier for a password-guessing program.
The -v flag causes the password-setting interaction to be visible. By default, it is suppressed.
The following example creates a 15-character password that contains 3 digits and 5 uppercase characters.
mkpasswd -l 15 -d 3 -C 5
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
Don Libes, National Institute of Standards and Technology
mkpasswd is in the public domain. NIST and I would appreciate credit if this program or parts of it are used.