Provided by: passwd_4.2-3.2ubuntu4_amd64 bug


       subgid - the subordinate gid file


       Each line in /etc/subgid contains a user name and a range of subordinate group ids that
       user is allowed to use. This is specified with three fields delimited by colons (“:”).
       These fields are:

       ·   login name

       ·   numerical subordinate group ID

       ·   numerical subordinate group ID count

       This file specifies the group IDs that ordinary users can use, with the newgidmap command,
       to configure gid mapping in a user namespace.

       Multiple ranges may be specified per user.


           Per user subordinate group IDs.

           Backup file for /etc/subgid.


       login.defs(5), newgidmap(1), newuidmap(1), newusers(8), subuid(5), useradd(8), userdel(8),
       usermod(8), user_namespaces(7).