To show all members of a group in Linux, you can use the getent command. This command can be used to retrieve entries from various databases, such as the passwd, shadow, and group databases.
To show all members of a group, you can use the following syntax:
$ getent group <groupname>
For example, to show all members of the adm group, you can use the following command:
$ getent group adm
This will print the group name, group password, and group members for the specified group.
You can also use the groups command to show all the groups that a user belongs to.
For example, to show all the groups that the current user belongs to, you can use the following command:
$ groups
To show the groups that a specific user belongs to, you can use the following syntax:
$ groups <username>
For example, to show all the groups that the user john belongs to, you can use the following command:
$ groups john
Finally, you can use the id command to show the user's group membership information, including the user's primary group and any supplementary groups.
For example, to show the group membership information for the current user, you can use the following command:
$ id
To show the group membership information for a specific user, you can use the following syntax:
$ id <username>
For example, to show the group membership information for the user john, you can use the following command:
$ id john