Which files are the source of the information in the following output? (Choose two.) uid=1000 (bob) gid=1000 (bob) groups=1000 (bob), 10 (wheel), 150 (docker), 1001 (libvirt)(wireshark),989
Correct Answer: B,C
Explanation The files /etc/passwd and /etc/group are the source of the information in the following output: uid=1000 (bob) gid=1000 (bob) groups=1000 (bob), 10 (wheel), 150 (docker), 1001 (libvirt) (wireshark), 989 The /etc/passwd file contains information about user accounts, such as the username, password, user ID (UID), group ID (GID), full name, home directory, and login shell1. The /etc/group file contains information about groups, such as the group name, password, group ID (GID), and members2. The output shows the UID, GID, and group membership of the user bob. The UID and GID of bob are 1000, which can be found in the /etc/passwd file. The groups that bob belongs to are bob, wheel, docker, libvirt, wireshark, and 989, which can be found in the /etc/group file. The group names are shown in parentheses after the GID, except for the last group, which has no name. The other options are not files that store user and group information in Linux. The /etc/id file does not exist by default. The /home/index file is not a standard file and has no relation to user and group information. The /var/db/users file is not a standard file and has no relation to user and group information. References: * Linux Essentials Exam Objectives, Version 1.6, Topic 103.1, Weight 2 * Linux Essentials Certification Guide, Chapter 3, Page 51-52 * Linux Filesystem Hierarchy, Chapter 3, Page 17-18 * Linux Users and Groups, Chapter 2, Page 9-10
Question 7
A user is currently in thedirectory/home/user/Downloads/and runs the command ls ../Documents/ Assuming it exists, which directory's content is displayed?
Correct Answer: E
Question 8
Which of the following commands creates an archive file work.tar from the contents of the directory ./ work/?
Correct Answer: B
The correct command to create an archive file work.tar from the contents of the directory ./work/ is tar -cf work.tar ./work/. This command uses the -c option to create a new archive, the -f option to specify the file name, and the ./work/ argument to indicate the source directory. The other commands are incorrect for various reasons: A . tar --new work.tar ./work/ is incorrect because there is no --new option in the tar command. The correct option for creating a new archive is --create or -c. C . tar -create work.tgz -content ./work/ is incorrect because the -content option is not valid. The correct option for specifying the source files or directories is --files-from or -T. Also, the work.tgz file name implies compression, but the command does not use any compression option such as -z, -j, or -J. D . tar work.tar < ./work/ is incorrect because the tar command does not accept input redirection from the standard input. The correct way to use the tar command is to provide the options and arguments after the command name. E . tar work > work.tar is incorrect because the tar command does not produce output redirection to the standard output. The correct way to use the tar command is to use the -f option to specify the output file name. Reference: : tar command in Linux with examples - GeeksforGeeks : tar Command in Linux With Examples | phoenixNAP KB
Question 9
Which of the following statements are true regarding a typical shell script? (Choose two.)
Correct Answer: A,B
A typical shell script is a text file that contains a series of commands or instructions that can be executed by a shell interpreter. A shell script usually has the executable permission bit set, which means that it can be run as a program by the user or another program. A shell script also starts with the two character sequence #!, which is called a shebang or a hashbang. This sequence tells the operating system which shell interpreter to use to run the script. For example, #!/bin/bash indicates that the script should be run by the bash shell. Reference: Linux Essentials - Linux Professional Institute (LPI) 1 Linux Essentials - Linux Professional Institute Certification Programs 2
Question 10
Which command displays file names only and no additional information?
Correct Answer: A
The ls command is used to list the files and directories in a given path. By default, the ls command displays only the file names, without any additional information. However, the ls command can also take various options to modify its output. For example, the -l option tells ls to display the long format, which includes the file permissions, owner, group, size, date, and name. The -h option tells ls to display the file sizes in a human-readable format, such as KB, MB, GB, etc. The -a option tells ls to display all files, including the hidden ones that start with a dot (.). The -n option tells ls to display the numeric user ID and group ID instead of the user name and group name. Therefore, the only option that does not add any additional information to the file names is the -a option. The command ls -a will display all the file names in the current directory, including the hidden ones, but nothing else. Reference: Linux Essentials - Linux Professional Institute (LPI), section 2.1.1 2.1 Lesson 1 - Linux Professional Institute Certification Programs, slide 6.
