Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #542
Difficulty: Medium
A globally scoped variable is invalid throughout the entire program.
True or False?
Linux & Unix Commands - Search Man Pages

passwd(1) [netbsd man page]

PASSWD(1)						    BSD General Commands Manual 						 PASSWD(1)

NAME
passwd -- modify a user's password SYNOPSIS
passwd [user] passwd [-d files | -l] [user] passwd [-d nis | -y] [user] passwd [-d krb5 | -k] [principal] DESCRIPTION
passwd changes the user's password. First, the user is prompted for their current password. If the current password is correctly typed, a new password is requested. The new password must be entered twice to avoid typing errors. The new password should be at least six characters long and not purely alphabetic. Its total length must be less than _PASSWORD_LEN (cur- rently 128 characters). Numbers, upper case letters and meta characters are encouraged. All options may not be available on all systems. -d database This option specifies the password database that should be updated. The following databases are supported: files This specifies that the password change should be applied to the local password file. When changing only the local password, passwd uses pwd_mkdb(8) to update the password databases. nis This specifies that the password change should be applied to the NIS password database. The rpc.yppasswdd(8) daemon should be running on the master NIS server. krb5 This specifies that the user's Kerberos 5 password should be changed. The host must be configured to use Kerberos. See krb5.conf(5). -l This is the equivalent of -d files. -y This is the equivalent of -d nis. -k This is the equivalent of -d krb5. If a password database is not specified, passwd will change the password database as determined by the Pluggable Authentication Module (PAM) library. The type of cipher used to encrypt the password depends on the configuration in passwd.conf(5). It can be different for local and NIS pass- words. FILES
/etc/master.passwd The user database /etc/passwd A Version 7 format password file /etc/passwd.XXXXXX Temporary copy of the password file SEE ALSO
chpass(1), login(1), pwhash(1), passwd(5), passwd.conf(5), pam(8), pwd_mkdb(8), vipw(8) Robert Morris and Ken Thompson, UNIX password security. HISTORY
A passwd command appeared in Version 6 AT&T UNIX. BSD
February 25, 2005 BSD

Check Out this Related Man Page

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

NAME
yppasswdd, rpc.yppasswdd - server daemon for modifying the Network Information Service (NIS) password file SYNOPSIS
/usr/sbin/rpc.yppasswdd file [-m arg1 arg2...] DESCRIPTION
The yppasswdd daemon is a server that handles password change requests from yppasswd(1). It changes a password entry in the specified file, which is assumed to be in the same format described in passwd(4). An entry in file will be changed only if the password presented by yppasswd(1) matches the encrypted password of that entry. If the -m option is given, then after file is modified, a make(1) will be performed in /var/yp. Any arguments following the option will be passed to make. The -m option should be set only at a NIS master server machine. This server is not run by default, nor can it be started up from inetd(8). If it is desired to enable remote password updating for the NIS, then an entry for yppasswdd should be put in the /sbin/init.d/nis file of the host serving as the master for the NIS passwd file. SECURITY NOTE
When enhanced security is installed and NIS is used to distribute the protected password authentication database, the yppasswdd daemon man- ages writes to that database. A strict C2 security policy, which is optionally configurable using enhanced security, requires each user login or login failure to be recorded in the protected password authentication database. These updates, in combination with password changes and system administration functions affecting user accounts, are coordinated by the daemon. EXAMPLES
If the NIS password file is stored as /var/yp/src/passwd, then to have password changes propagated immediately, the server should be invoked as: /usr/sbin/rpc.yppasswdd /var/yp/src/passwd -m passwd DIR= /var/yp/src FILES
SEE ALSO
Commands: yppasswd(1), ypmake(8) Files: passwd(4), ypfiles(4) yppasswdd(8)

Featured Tech Videos