CentOS 7.0 - man page for gpasswd (centos section 1)

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GPASSWD(1)				  User Commands 			       GPASSWD(1)

       gpasswd - administer /etc/group and /etc/gshadow

       gpasswd [option] group

       The gpasswd command is used to administer /etc/group, and /etc/gshadow. Every group can
       have administrators, members and a password.

       System administrators can use the -A option to define group administrator(s) and the -M
       option to define members. They have all rights of group administrators and members.

       gpasswd called by a group administrator with a group name only prompts for the new
       password of the group.

       If a password is set the members can still use newgrp(1) without a password, and
       non-members must supply the password.

   Notes about group passwords
       Group passwords are an inherent security problem since more than one person is permitted
       to know the password. However, groups are a useful tool for permitting co-operation
       between different users.

       Except for the -A and -M options, the options cannot be combined.

       The options which apply to the gpasswd command are:

       -a, --add user
	   Add the user to the named group.

       -d, --delete user
	   Remove the user from the named group.

       -h, --help
	   Display help message and exit.

       -Q, --root CHROOT_DIR
	   Apply changes in the CHROOT_DIR directory and use the configuration files from the
	   CHROOT_DIR directory.

       -r, --remove-password
	   Remove the password from the named group. The group password will be empty. Only group
	   members will be allowed to use newgrp to join the named group.

       -R, --restrict
	   Restrict the access to the named group. The group password is set to "!". Only group
	   members with a password will be allowed to use newgrp to join the named group.

       -A, --administrators user,...
	   Set the list of administrative users.

       -M, --members user,...
	   Set the list of group members.

       This tool only operates on the /etc/group and /etc/gshadow files.  Thus you cannot change
       any NIS or LDAP group. This must be performed on the corresponding server.

       The following configuration variables in /etc/login.defs change the behavior of this tool:

       ENCRYPT_METHOD (string)
	   This defines the system default encryption algorithm for encrypting passwords (if no
	   algorithm are specified on the command line).

	   It can take one of these values: DES (default), MD5, SHA256, SHA512.

	   Note: this parameter overrides the MD5_CRYPT_ENAB variable.

       MAX_MEMBERS_PER_GROUP (number)
	   Maximum members per group entry. When the maximum is reached, a new group entry (line)
	   is started in /etc/group (with the same name, same password, and same GID).

	   The default value is 0, meaning that there are no limits in the number of members in a

	   This feature (split group) permits to limit the length of lines in the group file.
	   This is useful to make sure that lines for NIS groups are not larger than 1024

	   If you need to enforce such limit, you can use 25.

	   Note: split groups may not be supported by all tools (even in the Shadow toolsuite).
	   You should not use this variable unless you really need it.

       MD5_CRYPT_ENAB (boolean)
	   Indicate if passwords must be encrypted using the MD5-based algorithm. If set to yes,
	   new passwords will be encrypted using the MD5-based algorithm compatible with the one
	   used by recent releases of FreeBSD. It supports passwords of unlimited length and
	   longer salt strings. Set to no if you need to copy encrypted passwords to other
	   systems which don't understand the new algorithm. Default is no.

	   This variable is superseded by the ENCRYPT_METHOD variable or by any command line
	   option used to configure the encryption algorithm.

	   This variable is deprecated. You should use ENCRYPT_METHOD.

	   When ENCRYPT_METHOD is set to SHA256 or SHA512, this defines the number of SHA rounds
	   used by the encryption algorithm by default (when the number of rounds is not
	   specified on the command line).

	   With a lot of rounds, it is more difficult to brute forcing the password. But note
	   also that more CPU resources will be needed to authenticate users.

	   If not specified, the libc will choose the default number of rounds (5000).

	   The values must be inside the 1000-999,999,999 range.

	   If only one of the SHA_CRYPT_MIN_ROUNDS or SHA_CRYPT_MAX_ROUNDS values is set, then
	   this value will be used.

	   If SHA_CRYPT_MIN_ROUNDS > SHA_CRYPT_MAX_ROUNDS, the highest value will be used.

	   Group account information.

	   Secure group account information.

       newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8), group(5), gshadow(5).

shadow-utils			    05/25/2012				       GPASSWD(1)
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