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This group is referred to as the primary group ID. A user may be listed as member of additional groups in the relevant entries in the group database, which can be viewed with getent group (usually stored in /etc/group or LDAP ); the IDs of these groups are referred to as supplementary group IDs .
Unix-like operating systems identify a user by a value called a user identifier, often abbreviated to user ID or UID. The UID, along with the group identifier (GID) and other access control criteria, is used to determine which system resources a user can access.
This includes the passwd and group databases which store user information – hence getent is a common way to look up user details on Unix. Since getent uses the same name service as the system, getent will show all information, including that gained from network information sources such as LDAP.
A NIS/YP system maintains and distributes a central directory of user and group information, hostnames, e-mail aliases and other text-based tables of information in a computer network. For example, in a common UNIX environment, the list of users for identification is placed in /etc/passwd and secret authentication hashes in /etc/shadow.
A user namespace contains a mapping table converting user IDs from the container's point of view to the system's point of view. This allows, for example, the root user to have user ID 0 in the container but is actually treated as user ID 1,400,000 by the system for ownership checks. A similar table is used for group ID mappings and ownership ...
The AIX Toolbox for Linux Applications is a collection of GNU tools for IBM AIX. [ 1 ] [ 2 ] [ 3 ] These tools are available for installation using Red Hat's RPM format. Licensing
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Nmap is a tool that can be used to discover services running on Internet connected systems. Like any tool, it could potentially be used for black hat hacking , [ 37 ] as a precursor to attempts to gain unauthorized access to computer systems.