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mkpasswd(1) [centos man page]

MKPASSWD(1)						      General Commands Manual						       MKPASSWD(1)

NAME
mkpasswd - generate new password, optionally apply it to a user SYNOPSIS
mkpasswd [ args ] [ user ] INTRODUCTION
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". USAGE
With no arguments, mkpasswd returns a new password. mkpasswd With a user name, mkpasswd assigns a new password to the user. mkpasswd don The passwords are randomly generated according to the flags below. FLAGS
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 minimum number of digits that must be in the password. The default is 2. The following example creates a password with at least 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 minimum number of uppercase alphabetic characters that must be in the password. The default is 2. The -s flag defines the minimum 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. EXAMPLE
The following example creates a 15-character password that contains at least 3 digits and 5 uppercase characters. mkpasswd -l 15 -d 3 -C 5 SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995. AUTHOR
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. 22 August 1994 MKPASSWD(1)

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mkpasswd(8)						      System Manager's Manual						       mkpasswd(8)

NAME
mkpasswd - Creates a version of the basic user database organized for efficient searches SYNOPSIS
/usr/sbin/mkpasswd [-v] [-s size] passwdfile DESCRIPTION
The mkpasswd command creates an auxiliary version of the basic user database in a form organized for efficient searches by the getpwuid subroutine and the getpwnam subroutine. The mkpasswd command reads the user attributes in the /etc/passwd file and creates a hashed pass- word database in the /etc/passwd.dir and /etc/passwd.pag files (see ndbm(3) reference page). If you specify a file other than /etc/passwd, the command reads the user attributes in that file and creates a hashed password database in the passwdfile.dir and passwdfile.pag files. It is important to know that the password file you designate must be in password file format (see the passwd(4) reference page). Note that if you use the vipw command to edit a password file, you do not need to use the mkpasswd command. This is because the vipw com- mand automatically invokes the mkpasswd command which in turn creates the /etc/passwd.dir and /etc/passwd.pag files. Only the root user should have execute access to the mkpasswd command. Files accessed: File /etc/passwd /etc/passwd.pag /etc/passwd.dir passwdfile passwdfile.pag passwdfile.dir The mkpasswd command may fail with a errno value of EFBIG if the password file is large (30,000 entries or more). This failure can be avoided by using the -s option to set a larger page block size for the hashed database. FLAGS
Specifies that each stored entry be listed on standard output Specifies the page block size to use in creating the hashed password data- base. The size argument is a value from 1 to 32, representing page block sizes from 1024 to 32768, respectively. The default page block size is 1024. EXAMPLES
If you have not used vipw to edit the /etc/passwd and wish to generate a hashed password database, enter the following: /usr/sbin/mkpasswd -v /etc/passwd An auxiliary version of the basic user database (/etc/passwd.dir and /etc/passwd.pag files) is created with a hashing algo- rithm. To create a hashed password database with a page block size of 8192, enter the following: /usr/sbin/makepasswd -s 8 /etc/passwd SECURITY NOTE
If enhanced security is running on your system, the passwords are stored in the extended attributes database. See the Security guide for more information about passwords in the enhanced security environment. RETURN VALUES
The mkpasswd command exits with a nonzero exit code if any errors are detected. ERRORS
If the mkpasswd request is not successful, the following error message is displayed: The passwdfile.dir and passwdfile.pag files already exist from a previous execution of the same mkpasswd command. FILES
Specifies the command path RELATED INFORMATION
Commands: adduser(8), passwd(1), passwd(4), vipw(8) Functions: getpwent(3), ndbm(3) Manuals: Security delim off mkpasswd(8)
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