Which file contains the list of all groups on a system?

Which file contains the list of all groups on a system?

• A. /etc/groups
• B. /etc/passwd
• C. /etc/group
• D. /group.txt

Answer: (C)

The file that contains the list of all groups on a Linux system is located at /etc/group. This file serves as a central database for group information, storing the group name, password (if used), group ID (GID), and the members of the group. Each entry in this file is structured in a way that enables the system to efficiently access group-related information. This is crucial for managing user permissions and access controls within the system. For instance, when a user logs in, the system checks their group memberships as defined in /etc/group to determine their access rights. In contrast, /etc/passwd contains user account information, including usernames and user IDs, but does not specifically list groups. The other choices, such as /etc/groups and /group.txt, do not represent standard files in Linux for group information. While /etc/group is the correct and standard file for this purpose, the other names do not have any significance in the context of group management within Linux systems.

The file that contains the list of all groups on a Linux system is located at /etc/group. This file serves as a central database for group information, storing the group name, password (if used), group ID (GID), and the members of the group.

Each entry in this file is structured in a way that enables the system to efficiently access group-related information. This is crucial for managing user permissions and access controls within the system. For instance, when a user logs in, the system checks their group memberships as defined in /etc/group to determine their access rights.

In contrast, /etc/passwd contains user account information, including usernames and user IDs, but does not specifically list groups. The other choices, such as /etc/groups and /group.txt, do not represent standard files in Linux for group information. While /etc/group is the correct and standard file for this purpose, the other names do not have any significance in the context of group management within Linux systems.