]> subuid 5 File Formats and Conversions shadow-utils &SHADOW_UTILS_VERSION; subuid the subordinate uid file Each line in /etc/subuid 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: login name numerical subordinate user ID numerical subordinate user ID count This file specifies the user IDs to be that each user may use with the newuidmap command that ordinary users can use to configure uid mapping in a user namespace. Multiple ranges may be specified per user ID. /etc/subuid Per user subordinate user IDs. /etc/subuid- Backup file for /etc/subuid. subgid5 , logindefs5 , newuidmap1 , newgidmap1 , usermod8 ,