GPASSWD(1) User Commands GPASSWD(1)
NAME
gpasswd - administer /etc/group and /etc/gshadow
SYNOPSIS
gpasswd [option] group
DESCRIPTION
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.
OPTIONS
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.
CAVEATS
This tool only operates on the /etc/groupand /etc/gshadow files. Thus you cannot change any NIS or LDAP
group. This must be performed on the corresponding server.
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 group.
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 characters.
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.
SHA_CRYPT_MIN_ROUNDS (number), SHA_CRYPT_MAX_ROUNDS (number)
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.
FILES
/etc/group
Group account information.
/etc/gshadow
Secure group account information.
SEE ALSO
newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8), group(5), gshadow(5).
shadow-utils 4.1.5.1 11/05/2016 GPASSWD(1)
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