]> newgidmap 1 User Commands shadow-utils &SHADOW_UTILS_VERSION; newgidmap set the gid mapping of a user namespace newgidmap pid gid lowergid count pid gid lowergid count ... The newgidmap sets /proc/[pid]/gid_map based on it's command line arguments and the gids allowed in /etc/subgid. There currently are no options to the newgidmap command. /etc/subgid List of users subordinate group IDs. /proc/[pid]/gid_map Mapping of gids from one between user namespaces. login.defs5 , useradd8 , usermod8 , newusers8 , userdel8 , subgid5 .