groupmod 8 System Management Commands groupmod modify a group groupmod -g gid -o -n new_group_name group The groupmod command modifies the system account files to reflect the changes that are specified on the command line. The options which apply to the groupmod command are: -g gid The numerical value of the group's ID. This value must be unique, unless the -o option is used. The value must be non-negative. Values between 0 and 999 are typically reserved for system groups. Any files which the old group ID is the file group ID must have the file group ID changed manually. -n new_group_name The name of the group will be changed from group to new_group_name. /etc/group Group account information. /etc/gshadow Secure group account information. The groupmod command exits with the following values: 0 success 2 invalid command syntax 3 invalid argument to option 4 specified group doesn't exist 6 specified group doesn't exist 9 group name already in use 10 can't update group file chfn1 , chsh1 , passwd1 , gpasswd8 , groupadd8 , groupdel8 , useradd8 , userdel8 , usermod8 .