Which command is used to find user and group names and IDs of the current user?

The command used to find the user and group names and IDs of the current user is "id." When executed, the "id" command provides a detailed output that includes the user ID (UID), the primary group ID (GID), and the IDs of any supplementary groups that the user is a member of. This makes it particularly useful for understanding the permissions and access levels associated with the current user in a Linux environment.

In contrast, the other options serve different purposes. "usermod" is typically used for modifying an existing user account, which does not provide information about the current user's identifiers. "whoami," while it shows the username of the current user, does not give any information about user IDs or group IDs. Finally, "groups" lists the groups to which the current user belongs but does not output the numeric IDs associated with those groups or the primary user's ID.