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| Section | Weight | Objectives |
|---|---|---|
| Finding Your Way on a Linux System | 20% | - Using Directories and Listing Files - Creating, Moving and Deleting Files - Command Line Basics |
| The Linux Operating System | 20% | - System Architecture - Processes and Services - File Systems and Hierarchy Standard - Hardware and Drivers |
| The Power of the Command Line | 25% | - Archiving and Compression - I/O Redirection and Pipelines - Basic Shell Scripting - Text Processing |
| The Linux Community and a Career in Open Source | 15% | - Applications and Support - Linux History and Philosophy - Open Source Software and Licensing - Linux Distributions |
| Security and File Permissions | 20% | - File Permissions and Ownership - User and Group Management - Basic Security Concepts |
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NEW QUESTION # 129
Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 stored on a DNS server?
Answer: D
Explanation:
Reverse DNS lookups query DNS servers for a PTR (pointer) record; if the server does not have a PTR record, it cannot resolve a reverse lookup. PTR records store IP addresses with their segments reversed, and they append ".in-addr.arpa" to that. For example, if a domain has an IP address of 192.0.2.1, the PTR record will store the domain's information under 1.2.0.192.in-addr.arpa. In IPv6, the latest version of the Internet Protocol, PTR records are stored within the ".ip6.arpa" domain instead of ".in-addr.arpa."1 Therefore, the name of the IP address 198.51.100.165 is stored in the PTR record for 165.100.51.198.in-addr.arpa. Reference: 1: Reverse DNS lookup - Wikipedia 1
NEW QUESTION # 130
What can be found in the /proc/ directory?
Answer: D
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', which points 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.
Reference:
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 # 131
Which of the following examples shows the general structure of a for loop in a shell script?
Answer: E
Explanation:
The general structure of a for loop in a shell script is as follows12:
for variable in list do commands done
The variable is the name of a loop counter or iterator that takes on the values of the items in the list. The list can be a sequence of words, numbers, filenames, or the output of a command. The commands are the body of the loop that are executed for each value of the variable. The do and done keywords mark the beginning and the end of the loop body.
The option C. for file in *.txt do echo $i done follows this structure, with the variable being file, the list being *.txt (which matches all the files with the .txt extension in the current directory), and the command being echo $i (which prints the value of the variable i, which is presumably set somewhere else in the script).
The other options are incorrect because:
A . for *.txt as file => echo $file uses an invalid syntax for a for loop. The as keyword is not part of the shell script syntax, and the => symbol is not a valid operator. The correct way to write this loop would be:
for file in *.txt do echo $file done
B . for *.txt ( echo $i ) uses an invalid syntax for a for loop. The parentheses are not part of the shell script syntax, and the loop body is missing the do and done keywords. The correct way to write this loop would be:
for i in *.txt do echo $i done
D . for ls *.txt exec {} ; uses an invalid syntax for a for loop. The ls command is not a valid variable name, and the exec {} ; is not a valid command. This looks like a mix of a for loop and a find command. The correct way to write this loop would be:
for file in *.txt do exec $file done
E . foreach @{file} { echo $i } uses an invalid syntax for a for loop. The foreach keyword is not part of the shell script syntax, and the @{file} and { echo $i } are not valid expressions. This looks like a mix of a for loop and a Perl syntax. The correct way to write this loop would be:
for file in * do echo $file done
Reference:
Looping Statements | Shell Script - GeeksforGeeks
How do I write a 'for' loop in Bash? - Stack Overflow
NEW QUESTION # 132
What are the differences between hard disk drives and solid state disks? (Choose two correct answers.)
Answer: A,D
NEW QUESTION # 133
What is true about a recursive directory listing?
Answer: C
Explanation:
A recursive directory listing is a way of displaying the files and folders in a directory and all its sub-directories. The recursive option can be used with various commands, such as ls, find, or dir, to list the files recursively. For example, the command ls -R will list all the files and folders in the current directory and any sub-directories, showing the hierarchy of the file system123 A recursive directory listing does not include the permissions, ownership, or file system details of the files, unless specified by other options. For example, the command ls -lR will list the files recursively and also show the permissions, ownership, size, and modification date of each file1 A recursive directory listing also does not include a preview of the content of each file, unless specified by other options. For example, the command ls -R --file-type will list the files recursively and also show the file type indicator, such as / for directories, * for executable files, @ for symbolic links, etc1 Reference: 1: ls (Unix) - Wikipedia 2: Recursively List all directories and files - Stack Overflow 3: Why is ls -R called "recursive" listing? - Ask Ubuntu
NEW QUESTION # 134
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