NEWGRP(1) User Commands NEWGRP(1)
newgrp - log in to a new group
newgrp [-] [group]
The newgrp command is used to change the current group ID during a login session. If the
optional - flag is given, the user's environment will be reinitialized as though the user
had logged in, otherwise the current environment, including current working directory,
newgrp changes the current real group ID to the named group, or to the default group
listed in /etc/passwd if no group name is given. newgrp also tries to add the group to
the user groupset. If not root, the user will be prompted for a password if she does not
have a password (in /etc/shadow if this user has an entry in the shadowed password file,
or in /etc/passwd otherwise) and the group does, or if the user is not listed as a member
and the group has a password. The user will be denied access if the group password is
empty and the user is not listed as a member.
If there is an entry for this group in /etc/gshadow, then the list of members and the
password of this group will be taken from this file, otherwise, the entry in /etc/group is
The following configuration variables in /etc/login.defs change the behavior of this tool:
Enable "syslog" logging of sg activity.
User account information.
Secure user account information.
Group account information.
Secure group account information.
id(1), login(1), su(1), sg(1), gpasswd(1), group(5), gshadow(5).
shadow-utils 22.214.171.124 05/25/2012 NEWGRP(1)