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MAN page from RedHat 6.X shadow-utils-980403-12.i386.rpm

SHADOW

Section: File Formats (5)
Index 

NAME

shadow - encrypted password file 

DESCRIPTION

shadowcontains the encrypted password information for user's accountsand 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 the64 character alphabeta thru z, A thru Z, 0 thru 9, . and /.Refer to crypt(3) for details on how this string isinterpreted.

The date of the last password change is given as the numberof days since Jan 1, 1970.The password may not be changed again until the proper numberof days have passed, and must be changed after the maximumnumber of days.If the minimum number of days required is greater than themaximum number of day allowed, this password may not bechanged by the user.

An account is considered to be inactive and is disabled ifthe password is not changed within the specified number ofdays after the password expires.An account will also be disabled on the specified dayregardless of other password expiration information.

This information supercedes any password or password ageinformation present in /etc/passwd.

This file must not be readable by regular users if passwordsecurity 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),sulogin(8),shadow(3),passwd(5),pwconv(8),pwunconv(8) 

AUTHOR

Julianne Frances Haugh (jfhAATTtab.com)


 

Index

NAME
DESCRIPTION
FILES
SEE ALSO
AUTHOR

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