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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: The Linux Operating System | 20% | - Processes and Services - File Systems and Hierarchy Standard - System Architecture - Hardware and Drivers |
| Topic 2: Finding Your Way on a Linux System | 20% | - Command Line Basics - Creating, Moving and Deleting Files - Using Directories and Listing Files |
| Topic 3: The Linux Community and a Career in Open Source | 15% | - Applications and Support - Linux Distributions - Open Source Software and Licensing - Linux History and Philosophy |
| Topic 4: Security and File Permissions | 20% | - File Permissions and Ownership - Basic Security Concepts - User and Group Management |
| Topic 5: The Power of the Command Line | 25% | - Archiving and Compression - Text Processing - I/O Redirection and Pipelines - Basic Shell Scripting |
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NEW QUESTION # 75
The current directory contains the following file:
-rw-r-r- 1 root exec 24551 Apr 2 12:36 test.sh
The file contains a valid shell script, but executing this file using./test.shleads to this error:
bash: ./test.sh: Permission denied
What should be done in order to successfully execute the script?
Answer: A
Explanation:
Explanation
The execute bit in Linux is a permission bit that allows the user to run an executable file or enter a directory.
For regular files, such as scripts or binaries, the execute bit must be set for the user to run them. For directories, the execute bit allows the user to access the files and subdirectories inside. Therefore, to successfully execute the script test.sh, the execute bit should be set in the file's permissions. This can be done by using the chmod command with the +x option, for example: chmod +x test.sh. The other options are either irrelevant or incorrect. The file's extension does not affect its executability, only its association with a program. The user executing the script does not need to be in the exec group, as long as the user has the execute permission on the file. The SetUID bit is a special permission bit that allows the user to run the file as the file's owner, regardless of the user's identity. This is not necessary for executing the script, and may pose a security risk. The #!./test.sh syntax is invalid, as the #! is used to specify the interpreter for the script, not the script itself. References:
* Linux Essentials Version 1.6 Objectives1, Topic 1.4: Command Line Basics, Subtopic: Basic Shell Commands
* Linux Essentials Version 1.6 Exam Preparation Guide2, Section 1.4: Command Line Basics, Page 16
* Execute vs Read bit. How do directory permissions in Linux work?3
NEW QUESTION # 76
What is a Linux distribution?
Answer: C
Explanation:
A Linux distribution is a collection of software that is based on the Linux kernel and can be installed on a computer or a device to create a functional operating system. A Linux distribution typically includes the Linux kernel, a set of system utilities and libraries, a graphical user interface (GUI), a package manager, and various applications and services. A Linux distribution may also include additional software or features that are specific to the distribution's goals, target audience, or philosophy. For example, some Linux distributions are designed for desktop users, while others are optimized for servers, embedded systems, or security. Some Linux distributions are based on other Linux distributions, while others are developed independently. Some Linux distributions are free and open source, while others are proprietary or commercial. Some Linux distributions are popular and widely used, while others are niche or experimental. Some examples of Linux distributions are Ubuntu, Fedora, Debian, Mint, Arch, and Red Hat. Reference:
Linux Essentials Topic 101: System Architecture, section 101.1: Determine and configure hardware settings.
Linux Essentials Topic 102: Linux Installation and Package Management, section 102.1: Design hard disk layout.
Linux Essentials Topic 103: GNU and Unix Commands, section 103.1: Work on the command line.
Linux Essentials Topic 104: The Linux Operating System, section 104.1: Boot the system.
Linux Essentials Topic 105: The Power of the Command Line, section 105.1: Use text streams and filters.
Linux Essentials Topic 106: Security and File Permissions, section 106.3: Modify file and directory permissions.
What is a Linux distribution? - Linux.com
Linux distribution - Wikipedia
Best Linux Distributions For Everyone in 2023 - It's FOSS
NEW QUESTION # 77
Which of the following commands output the content of the file Texts 2.txt? (Choose two.)
Answer: B,D
Explanation:
Explanation
The correct commands to output the content of the file Texts 2.txt are A and E. These commands use the cat command, which stands for concatenate, to display the content of one or more files. The cat command can take one or more filenames as arguments and print their content to the standard output (usually the terminal screen)12. The commands A and E use different ways to deal with the space character in the filename. The space character is a special character in Linux that separates words and commands. To prevent the shell from interpreting the space as a word separator, the commands A and E use either of the following methods34:
* Option A uses single quotes (') around the filename to preserve the literal value of the space character.
This tells the shell to treat the filename as a single argument and pass it to the cat command. For example: cat 'Texts 2.txt'
* Option E uses a backslash () before the space character to escape its special meaning. This tells the shell to ignore the space as a word separator and treat it as part of the filename. For example: cat Texts\ 2.txt The other options are incorrect because they use different syntax that do not output the content of the file. For example:
* Option B uses a double dash (-) before the filename to indicate the end of options. This is usually used to prevent the shell from interpreting a filename that starts with a dash (-) as an option. However, in this case, the filename does not start with a dash, so the double dash is unnecessary and will cause the command to fail. For example: cat - Texts 2.txt
* Option C uses vertical bars (|) around the filename to indicate a pipe. A pipe is a way of connecting the output of one command to the input of another command. However, in this case, there is no command before or after the pipe, so the pipe is meaningless and will cause the command to fail. For example: cat
|Texts 2.txt|
* Option D uses single quotes (') and a backslash () together around the filename. This is redundant and will cause the command to fail. The single quotes already preserve the literal value of the space character, so the backslash is not needed. Moreover, the backslash inside the single quotes will be treated as part of the filename, not as an escape character. For example: cat 'Texts\ 2.txt' References: 1: How to Use Linux Cat Command (With Examples) - phoenixNAP 2: Cat command in Linux with examples - GeeksforGeeks 3: How to escape spaces in path during scp copy in Linux? - Stack Overflow 4: How to handle spaces in file names when using xargs on find results? - Ask Ubuntu
NEW QUESTION # 78
What is true about the dmesgcommand? (Choose two.)
Answer: B,E
NEW QUESTION # 79
Which of the following devices represents a hard disk partition?
Answer: A
NEW QUESTION # 80
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