Full Discussion: rules for new password?
Top Forums UNIX for Dummies Questions & Answers rules for new password? Post 302359050 by zTodd on Monday 5th of October 2009 05:11:26 PM
Old 10-05-2009
rules for new password?

What are the rules for choosing a new password when the old one expires? I notice when I try to use a password that is similar to my previous one then it won't take it. Got me wondering what the exact rules are- as in, how different does it have to be from previous passwords.
 

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SHADOW(5)							File Formats Manual							 SHADOW(5)

NAME
shadow - encrypted password file DESCRIPTION
shadow contains the encrypted password information for user's accounts and optional the password aging information. Included is Login name Encrypted password Days since Jan 1, 1970 that password was last changed Days before password may be changed Days after which password must be changed Days before password is to expire that user is warned Days after password expires that account is disabled Days since Jan 1, 1970 that account is disabled A reserved field The password field must be filled. The encryped password consists of 13 to 24 characters from the 64 character alphabet a thru z, A thru Z, 0 thru 9, . and /. Refer to crypt(3) for details on how this string is interpreted. The date of the last password change is given as the number of days since Jan 1, 1970. The password may not be changed again until the proper number of days have passed, and must be changed after the maximum number of days. If the minimum number of days required is greater than the maximum number of day allowed, this password may not be changed by the user. An account is considered to be inactive and is disabled if the password is not changed within the specified number of days after the pass- word expires. An account will also be disabled on the specified day regardless of other password expiration information. This information supercedes any password or password age information present in /etc/passwd. This file must not be readable by regular users if password security is to be maintained. FILES
/etc/passwd - user account information /etc/shadow - encrypted user passwords SEE ALSO
chage(1), login(1), passwd(1), su(1), passwd(5), pwconv(8), pwunconv(8), sulogin(8) AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com) SHADOW(5)

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