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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Finding Your Way on a Linux System | 20% | - Creating, Moving and Deleting Files - Command Line Basics - Using Directories and Listing Files |
| Topic 2: The Power of the Command Line | 25% | - Text Processing - Basic Shell Scripting - I/O Redirection and Pipelines - Archiving and Compression |
| Topic 3: Security and File Permissions | 20% | - User and Group Management - File Permissions and Ownership - Basic Security Concepts |
| Topic 4: The Linux Operating System | 20% | - File Systems and Hierarchy Standard - System Architecture - Processes and Services - Hardware and Drivers |
| Topic 5: The Linux Community and a Career in Open Source | 15% | - Open Source Software and Licensing - Applications and Support - Linux Distributions - Linux History and Philosophy |
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NEW QUESTION # 92
What is the preferred source for the installation of new applications in a Linux based operating system?
Answer: C
Explanation:
The distribution's package repository is the preferred source for the installation of new applications in a Linux based operating system. A package repository is a collection of software packages that are maintained by the distribution and can be easily installed, updated, or removed using a package manager. Package repositories offer several advantages, such as:
They ensure compatibility and stability with the system and other packages.
They provide security updates and bug fixes for the packages.
They reduce the risk of malware or corrupted files.
They simplify the dependency management and configuration of the packages.
The other sources are not preferred because they may not offer these benefits and may cause problems with the system. The vendor's version management system, the vendor's website, or a CD-ROM disk may contain packages that are not compatible with the distribution or may conflict with other packages. A retail store may not have the latest or the most suitable packages for the system. Reference:
Linux Essentials - Linux Professional Institute (LPI), section 1.3 Installing, Updating and Removing Software Packages LPI Linux Essentials Study Guide: Exam 010 v1.6, 3rd Edition, chapter 4 Working on the Command Line, section 4.2 Managing Software Table of Contents - Linux Professional Institute Certification Programs, section 1.3 Installing, Updating and Removing Software Packages
NEW QUESTION # 93
What can be found in the /proc/ directory?
Answer: B
Explanation:
Explanation
The /proc/ directory is a virtual file system that contains information about the system and the processes running on it. It is not a conventional file system that stores files on a disk, but rather a dynamic view of the kernel's data structures. One of the features of the /proc/ directory is that it contains one subdirectory for each process running on the system, which is named after the process ID (PID). For example, the subdirectory
/proc/1/ contains information about the process with PID 1, which is usually the init process. The process subdirectories contain various files that provide information about the process, such as its status, memory usage, open files, environment variables, command line arguments, and more. The /proc/ directory also contains a symbolic link called 'self', whichpoints to the process that is accessing the /proc/ file system.
Therefore, the correct answer is D. One directory per running process.
The other options are incorrect because:
* A. One directory per installed program. This is not true, as the /proc/ directory does not contain information about installed programs, but only about running processes. Installed programs are usually stored in other directories, such as /bin/, /usr/bin/, /opt/, etc.
* B. One device file per hardware device. This is not true, as the /proc/ directory does not contain device files, but only virtual files that represent kernel data. Device files are usually stored in the /dev/
* directory, which is another special file system that provides access to hardware devices.
* C. One file per existing user account. This is not true, as the /proc/ directory does not contain information about user accounts, but only about processes. User accounts are usually stored in the /etc/ directory, which contains configuration files, such as /etc/passwd/ and /etc/shadow/, that define the users and their passwords.
* E. One log file per running service. This is not true, as the /proc/ directory does not contain log files, but only information files. Log files are usually stored in the /var/log/ directory, which contains various files that record the activities of the system and the services.
References:
* The /proc Filesystem - The Linux Kernel documentation
* A Beginner's Guide to the /proc File System in Linux - Tecmint
* Appendix E. The proc File System Red Hat Enterprise Linux 6 | Red Hat ...
* Chapter 5. The proc File System Red Hat Enterprise Linux 4 | Red Hat ...
* proc file system in Linux - GeeksforGeeks
NEW QUESTION # 94
Which of the following tasks can the command passwd accomplish? (Choose two.)
Answer: A,B
Explanation:
Explanation
The passwd command in Linux is used to change the password of a user account. A normal user can run passwd to change their own password, and a system administrator (the superuser) can use passwd to change another user's password, or define how that account's password can beused or changed1. The passwd command can also be used to lock or unlock a user account. Locking a user account means disabling the user's ability to log in to the system, while unlocking a user account means restoring the user's ability to log in. To lock a user account, the passwd command can be used with the -l option, followed by the username. To unlock a user account, the passwd command can be used with the -u option, followed by the username12. The passwd command cannot be used to change a user's username, create a new user account, or create a new user group. These tasks require different commands, such as usermod, useradd, orgroupadd345. References: 1:
Linux Passwd Command Help and Examples 2: Passwd command in Linux: 8 Practical Examples 3:
usermod(8) - Linux man page 4: useradd(8) - Linux man page 5: groupadd(8) - Linux man page
NEW QUESTION # 95
Which command copies the contents of the directory /etc/, including all sub-directories, to /root/?
Answer: B
Explanation:
Explanation
The correct command to copy the contents of the directory /etc/, including all sub-directories, to /root/ is cp -r
/etc/* /root. This command uses the cp command, which stands for copy, and is used to copy files and directories on Linux and Unix systems. The command also uses the following options and arguments123:
* The -r option, which stands for recursive, and tells cp to copy all files and sub-directories of the source directory. Alternatively, the -R option can be used, which has the same effect as -r.
* The /etc/* argument, which specifies the source directory and all its contents. The asterisk (*) is a wildcard character that matches any file or directory name. This argument tells cp to copy everything inside the /etc/ directory, but not the directory itself.
* The /root argument, which specifies the destination directory. This argument tells cp to copy the source files and sub-directories to the /root/ directory.
The other options are incorrect because they use different commands or syntax that do not copy the contents of the directory /etc/, including all sub-directories, to /root/. For example:
* Option A uses the copy command, which is not a valid Linux command. The correct command is cp.
* Option C uses the -v option, which stands for verbose, and tells cp to print verbose output. This option does not affect the copying process, but only the output. It also does not include the -r or -R option, which is necessary to copy the sub-directories.
* Option D uses the rcp command, which stands for remote copy, and is used to copy files between different hosts on a network. This command is not relevant for copying files on the same host.
* Option E uses the -R option, which is correct, but also uses the . argument, which is incorrect. The dot (.) is a special character that matches any single character. This argument tells cp to copy only the files and directories that have a dot in their name, which may exclude some files and directories that do not have a dot.
References: 1: Cp Command in Linux (Copy Files) | Linuxize 2: cp command in Linux with examples - GeeksforGeeks 3: How to Copy Files and Directories in the Linux Terminal
NEW QUESTION # 96
The file script.sh in the current directory contains the following content:
#!/bin/bash echo $MYVAR
The following commands are used to execute this script:
MYVAR=value
./script.sh
The result is an empty line instead of the content of the variable MYVAR. How should MYVAR be set in order to make script.sh display the content of MYVAR?
Answer: B
Explanation:
Explanation
The reason why the script.sh does not display the content of the variable MYVAR is that the variable is not exported to the environment of the script. When a script is executed, it runs in a separate process that inherits the environment variables from the parent process, but not the shell variables. A shell variable is a variable that is defined and visible only in the current shell session, while an environment variable is a variable that is exported to the environment and visible to all processes that run in that environment1.
To make a shell variable an environment variable, we need to use the export command. The export command takes a shell variable name and adds it to the environment of the current shell and any subshells or processes that are created from it2. For example, to export the variable MYVAR with the value value, we can use:
export MYVAR=value
This will make the variable MYVAR available to the script.sh when it is executed, and the script will print the value of MYVAR as expected. Alternatively, we can also use the export command with the -n option to remove a variable from the environment, or with the -p option to list all the environment variables2.
The other options are not valid ways to set MYVAR as an environment variable. The !MYVAR=value option is not a valid syntax for setting a variable in bash. The env MYVAR=value option will run the env command with the MYVAR=value argument, which will print the environment variables with the addition of MYVAR=value, but it will not affect the current shell or the script.sh3. The MYVAR=value option will set MYVAR as a shell variable, but not as an environment variable, so it will not be visible to the script.sh1. The
$MYVAR=value option will try to set the variable whose name is the value of MYVAR to the value value, which is not what we want4. References:
* Linux Essentials Exam Objectives, Version 1.6, Topic 103.1, Weight 2
* Linux Essentials Certification Guide, Chapter 3, Page 51-52
* env(1) - Linux manual page
* Bash Variables - LinuxConfig.org
NEW QUESTION # 97
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