Each line in /etc/subgid contains a user id and a range of suboridinate
user ids that user is allowed to use. This is specified with three
fields delimited by colons (":"). These fields are:
o login name
o numerical subordinate user ID
o numerical subordinate user ID count
This file specifies the group IDs to be that each user may use with the
newgidmap command that ordinary users can use to configure gid mapping
in a user namespace.
Multiple ranges may be specified per user ID.
Per user subordinate group IDs.
Backup file for /etc/subgid.
subuid(5), login.defs(5), newuidmap(1), newgidmap(1), usermod(8),
shadow-utils 18.104.22.168 05/16/2017 SUBGID(5)
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