Free LPI Linux Essentials - Exam 010, (version 1.6) 010-160 Exam Questions

The command that displays manual pages for Linux commands is themancommand. The man command is used to display the manual pages for a given command or topic. For example, to view the manual page for the ls command, you can type:

man ls

This will open the manual page for the ls command in a pager, which allows you to scroll and search through the text. You can also specify the section number of the manual page if there are multiple pages with the same name. For example, to view the manual page for the passwd command in section 1, you can type:

man 1 passwd

The man command is one of the most useful and important commands for learning and using Linux. It provides detailed information about the syntax, options, arguments, examples, and other aspects of a command or topic. You can also use the --help option to get a brief summary of the usage and options of a command. For example, to get a quick help for the man command, you can type:

man --help

To learn more about the man command and how to use it effectively, you can refer to the following resources:

Linux Essentials Exam Objectives, Version 1.6, Topic 103.1, Weight 2

Linux Essentials Certification Guide, Chapter 3, Page 51-52

How to Access Manual Pages for Linux Commands- Linux Tutorials - Learn Linux Configuration

How to Easily Read a Linux Man Page- Make Tech Easier

The return value of a shell script after successful execution is 0. This is a convention followed by most UNIX and Linux commands, programs, and utilities. A return value of 0 indicates that the command or script completed successfully, without any errors. A return value of non-zero (1-255) indicates that the command or script failed, and the value can be interpreted as an error code.The return value of a command or script is stored in the special variable $? and can be used to test the outcome of a command or script123. For example, the following script will print a message based on the return value of the ls command:

#!/bin/bash ls if [ $? -eq 0 ]; then echo ''ls command executed successfully'' else echo ''ls command failed'' fi

The DNS record types that hold an IP address are the A and AAAA records. These records are used to map a domain name to an IP address of the host, which is necessary for establishing a connection between a client and a server. The A record holds a 32-bit IPv4 address, while the AAAA record holds a 128-bit IPv6 address. For example, the A record for www.example.com could be:

www.example.com. IN A 192.0.2.1

This means that the domain name www.example.com resolves to the IPv4 address 192.0.2.1. Similarly, the AAAA record for www.example.com could be:

www.example.com. IN AAAA 2001:db8::1

This means that the domain name www.example.com resolves to the IPv6 address 2001:db8::1.

The other options are incorrect because:

NS records are used to specify the authoritative name servers for a domain. They do not hold an IP address, but a domain name of the name server. For example, the NS record for example.com could be:

example.com. IN NS ns1.example.com.

This means that the name server ns1.example.com is authoritative for the domain example.com.

MX records are used to specify the mail exchange servers for a domain. They do not hold an IP address, but a domain name of the mail server and a preference value. For example, the MX record for example.com could be:

example.com. IN MX 10 mail.example.com.

This means that the mail server mail.example.com has a preference value of 10 for receiving email for the domain example.com.

CNAME records are used to create an alias for a domain name. They do not hold an IP address, but another domain name that the alias points to. For example, the CNAME record for www.example.com could be:

www.example.com. IN CNAME example.com.

This means that the domain name www.example.com is an alias for the domain name example.com.

DNS Record Types: Defined and Explained - Site24x7

List of DNS record types - Wikipedia

In an Infrastructure as a Service (IaaS) cloud, the provider offers virtualized computing resources such as servers, storage, and network over the internet. The user can provision and manage these resources according to their needs. One of the common ways to provision a new Linux computing instance in an IaaS cloud is to use a pre-prepared image of a Linux distribution provided by the cloud hosting organization. An image is a snapshot of a virtual machine that contains the operating system and other software components. The user can choose from a variety of images that suit their requirements and launch a new instance from the image. This way, the user does not have to install and configure the Linux operating system from scratch, which saves time and effort. Some examples of cloud hosting organizations that provide pre-prepared images of popular Linux distributions are Amazon Web Services (AWS), Microsoft Azure, Google Cloud Platform (GCP), and DigitalOcean.Reference:Linux Essentials - Topic 108: Cloud ComputingandLinux Essentials - Topic 108: Cloud Computing - Exam Objectives

The /etc/skel directory is a skeleton directory that contains the default files and directories that are automatically copied to the home directory of a new user when the account is created by the useradd command12.The purpose of this directory is to provide a consistent and uniform environment for all new users and to save the system administrator's time and effort in configuring the user settings12.The /etc/skel directory can be customized by adding or removing files and directories as needed, depending on the desired default settings for the new users12.

The other options are incorrect because:

A . The personal user settings of root are stored in this directory.This is not true, as the personal user settings of root are stored in the /root directory, which is the home directory of the root user3.The /etc/skel directory does not affect the root user's settings, but only the settings of the new users created by the useradd command12.

B . The files from the directory are copied to the home directory of the new user when starting the system.This is not true, as the files from the directory are copied to the home directory of the new user when the account is created, not when starting the system12.The copying process only happens once, when the useradd command is executed, and not every time the system is started12.

E . The directory contains the global settings for the Linux system.This is not true, as the directory contains the default settings for the new users, not the global settings for the Linux system12.The global settings for the Linux system are usually stored in other directories under /etc, such as /etc/default, /etc/sysconfig, /etc/init.d, etc4.

Understanding the /etc/skel directory in Linux -- The Geek Diary

/etc/skel directory in Linux - techPiezo

Linux File System Hierarchy - /root directory - LinuxConfig.org

Linux configuration: Understanding *.d directories in /etc | Enable Sysadmin

The PATH environment variable is a special variable that contains a list of directories that the system searches when looking for a command to execute12. The purpose of the PATH variable is to make it easier and faster for users to run commands without having to type the full path to the executable file. For example, if you want to run the ls command, which is located in the /bin directory, you don't have to type /bin/ls every time. You can just type ls, and the system will find the executable file in the /bin directory, which is one of the directories in the PATH variable.The PATH variable can be viewed with the echo command12:

$ echo $PATH

The PATH variable can also be modified by adding or removing directories, either temporarily or permanently, depending on the user's needs12.For example, if you have a custom script or program in your home directory, and you want to run it from anywhere, you can add your home directory to the PATH variable with the export command12:

$ export PATH=$PATH:~/myprogram

This will append your home directory to the end of the PATH variable, and the system will search it last when looking for a command.To make this change permanent, you need to edit a configuration file, such as ~/.bashrc or ~/.profile, and add the export command there12.

How To View and Update the Linux PATH Environment Variable | DigitalOcean

Linux path environment variable - Linux command line - LinuxConfig.org

The keyword for is used in a shell script to begin a loop that iterates over a list of items or a range of numbers. The syntax of the for loop is as follows:

for <var> in <list> do <commands> done

The variable <var> is assigned to each element of the <list> in turn, and the <commands> are executed for each iteration. The <list> can be a sequence of words, numbers, filenames, or other values. If the <list> is omitted, the for loop will iterate over the positional parameters ($1, $2, ...). The do and done keywords mark the beginning and the end of the loop body, respectively.The for loop is one of the three types of loops in shell scripting, along with the while and until loops.Reference:1: Looping Statements | Shell Script - GeeksforGeeks12: unix - Shell script 'for' loop syntax - Stack Overflow23: For Loop Shell Scripting - javatpoint3

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

The last command in Linux is used to display the list of all the users logged in and out since the file/var/log/wtmpwas created1.The output of the last command shows the username, the terminal, the IP address, the login time and date, and the duration of the session for each record2. The option E is the only one that matches this format. The other options are not related to the last command. Option A shows a list of commands executed by a user. Option B shows the password change information for a user. Option C shows the last login information for a user. Option D shows the mount information for a filesystem.Reference:

Linux Essentials Version 1.6 Objectives3, Topic 1.4: Command Line Basics, Subtopic: Basic Shell Commands

Linux last Command Tutorial for Beginners (8 Examples)4

Linux Essentials Version 1.6 Exam Preparation Guide, Section 1.4: Command Line Basics, Page 16