What is the main difference between the batch and at commands?
Correct Answer: A
Question 42
What is Irue regarding public and private SSH keys? (Choose TWO correct answers.)
Correct Answer: A,C
Question 43
Which of the following find commands will print out a list of files owned by root and with the SUID bit set in /usr?
Correct Answer: A
This command will find all the files in the /usr directory that have the user ID (UID) of 0, which is the root user, and have the permission of 4000, which is the SUID bit. The SUID bit allows the file to be executed with the privileges of the file owner, regardless of who runs it. The -uid option tests for a specific UID, and the -perm option tests for a specific permission. The + sign before the permission means that at least those bits are set; the - sign means that exactly those bits are set. The other options are either invalid or do not match the criteria. Reference: LPIC-1 Exam 102 Objectives, Topic 104: Devices, Linux Filesystems, Filesystem Hierarchy Standard, 104.4 Find system files and place files in the correct location, Key Knowledge Areas: Search for files by type, size, or time find manual page, -uid and -perm options description Find Command in Linux with Practical Examples, Example 8: Find Files with SUID and SGID Permissions
Question 44
Which of the following can the chage command NOT change?
Correct Answer: E
The chage command can change the following parameters related to user password expiry and aging: * The last password change date (-d or --lastday option) * The password expiry date (-E or --expiredate option) * The minimum number of days between password changes (-m or --mindays option) * The maximum number of days during which a password is valid (-M or --maxdays option) * The number of days of warning before password expires (-W or --warndays option) The chage command cannot change the number of days of inactivity after a password has expired before the account is locked. This parameter is controlled by the -I or --inactive option of the usermod command, which modifies the user account information. The chage command only displays the current value of this parameter, but does not allow changing it. References: * chage command in Linux with examples - GeeksforGeeks * 10 chage command examples in Linux [Cheat Sheet] - GoLinuxCloud * How to Use the Chage Command in Linux - TecAdmin * How to Manage User Password Expiration and Aging in Linux - Tecmint
Question 45
Which of the following commands can remove a user from a group?
Correct Answer: E
The usermod command is a utility for modifying user accounts. One of its options is -G, which allows specifying a list of supplementary groups that the user is a member of. If the user is currently a member of a group that is not listed, the user will be removed from that group. For example, to remove the user alice from the group sales, one can use the command sudo usermod -G admin alice, assuming that alice is only a member of admin and sales groups. Alternatively, one can use the gpasswd command with the --delete option to remove a user from a specific group without affecting other groups. For example, to remove the user alice from the group sales, one can use the command sudo gpasswd --delete alice sales. The other commands in the options are not used for removing a user from a group. The grouprm command does not exist. The groupmod command is used for modifying group attributes, not membership. The passwd command is used for changing user passwords, not groups. The usergroups command is used for displaying the groups that a user belongs to, not modifying them. References: * usermod(8) - Linux man page * gpasswd(1) - Linux man page * How to Remove User From Group in Linux [Quick Tip]
