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| Section | Weight | Objectives |
|---|---|---|
| Security and File Permissions | 20% | - User and Group Management - File Permissions and Ownership - Basic Security Concepts |
| Finding Your Way on a Linux System | 20% | - Command Line Basics - Creating, Moving and Deleting Files - Using Directories and Listing Files |
| The Linux Community and a Career in Open Source | 15% | - Linux Distributions - Linux History and Philosophy - Open Source Software and Licensing - Applications and Support |
| The Linux Operating System | 20% | - Processes and Services - Hardware and Drivers - File Systems and Hierarchy Standard - System Architecture |
| The Power of the Command Line | 25% | - Basic Shell Scripting - I/O Redirection and Pipelines - Archiving and Compression - Text Processing |
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NEW QUESTION # 105
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: E
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 # 106
Which of the following commands will set the variable text to olaf is home? (Select TWO answers)
Answer: A,B
NEW QUESTION # 107
What is true about the dmesg command? (Choose two correct answers.)
Answer: A,D
Explanation:
The dmesg command is used to display the messages from the kernel that are stored in a ring buffer. A ring buffer is a fixed-size data structure that overwrites the oldest entries when it is full. Therefore, the dmesg command might not display older information because it was overwritten by newer information. The dmesg command is useful for troubleshooting system issues and checking hardware information. The dmesg command is not used to trace the execution of a command, send messages to user sessions, or output the system journal. Those functions are performed by other commands such as strace, write, and journalctl respectively. Reference: : [dmesg] : [Ring buffer] : [strace] : [write (Unix)] : [journalctl]4)
NEW QUESTION # 108
Running the commandrm Downloadsleads to the following error:
rm: cannot remove 'Downloads/': Is a directory
Which of the following commands can be used instead to removeDownloads, assumingDownloadsis empty? (Choose two correct answers.)
Answer: D,E
Explanation:
Explanation
To remove a directory, you need to use a command that can delete directories, not just files. The rm command can only remove files by default, unless you use the -r option, which stands for recursive. This option tells rm to delete the directory and all of its contents, including subdirectories and files. The rmdir command can also remove directories, but only if they are empty. If the directory contains any files or subdirectories, rmdir will fail and display an error message. Therefore, the correct commands to remove Downloads, assuming it is empty, are rmdir Downloads and rm -r Downloads. The other commands are either invalid or do not work on directories. References:
* Linux Essentials - Linux Professional Institute (LPI), section 2.3.1
* LPI Linux Essentials Study Guide: Exam 010 v1.6, 3rd Edition, chapter 4, page 93.
NEW QUESTION # 109
Which of the following taroptions handle compression? (Choose two.)
Answer: B,E
NEW QUESTION # 110
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