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RedHat 9 (Linux i386) - man page for gpasswd (redhat section 1)

GPASSWD(1)						      General Commands Manual							GPASSWD(1)

gpasswd - administer the /etc/group file
gpasswd group gpasswd -a user group gpasswd -d user group gpasswd -R group gpasswd -r group gpasswd [-A user,...] [-M user,...] group
gpasswd is used to administer the /etc/group file (and /etc/gshadow file if compiled with SHADOWGRP defined). Every group can have adminis- trators, members and a password. System administrator can use -A option to define group administrator(s) and -M option to define members and has all rights of group administrators and members. Group administrator can add and delete users using -a and -d options respectively. Administrators can use -r option to remove group pass- word. When no password is set only group members can use newgrp(1) to join the group. Option -R disables access to the group through new- grp(1) command. gpasswd called by a group administrator with group name only prompts for the group password. If password is set the members can still new- grp(1) without a password, non-members must supply the password.
/etc/group - group information /etc/gshadow - shadow group information
newgrp(1), groupadd(8), groupdel(8), groupmod(8), grpck(8)
Rafal Maszkowski <> GPASSWD(1)