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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: The Power of the Command Line | 40% | - Pipes, Redirection and Variables
|
| Topic 2: Security and File Permissions | 13% | - Basic Security and User Types
|
| Topic 3: The Linux Community and a Career in Open Source | 7% | - Open Source Software and Licensing
|
| Topic 4: Finding Your Way on a Linux System | 20% | - Creating, Moving and Deleting Files
|
| Topic 5: The Linux Operating System | 20% | - Choosing an Operating System
|
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NEW QUESTION # 65
Which command shows the absolute path of the current working directory?
Answer: B
NEW QUESTION # 66
Which of the following programs are web servers? (Choose two.)
Answer: B,E
Explanation:
Explanation
NEW QUESTION # 67
Which of the following examples shows the general structure of a for loop in a shell script?
Answer: C
Explanation:
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
References:
* Looping Statements | Shell Script - GeeksforGeeks
* How do I write a 'for' loop in Bash? - Stack Overflow
NEW QUESTION # 68
What is defined by a Free Software license?
Answer: C
Explanation:
Explanation
A free software license is a notice that grants the recipient of a piece of software extensive rights to modify and redistribute that software. These actions are usually prohibited by copyright law, but the rights-holder (usually the author) of a piece of software can remove these restrictions by accompanying the software with a software license which grants the recipient these rights. Software using such a license is free software (or free and open-source software) as conferred by the copyright holder. Free software licenses grant users the freedom to use it for any purpose, study and change the source code and copy and redistribute the software with or without modifications. Free software must come with source code or provide access to it, while the freedom to redistribute includes the right to give away copies gratis as well as sell copies1 References: 1: Free-software license - Wikipedia
NEW QUESTION # 69
A directory contains the following files:
What would be the output of the following shell script?
for file in *.txt
Answer: E
Explanation:
b. txt
Explanation:
The shell script uses a for loop to iterate over the files that match the pattern *.txt in the current directory. The pattern *.txt means any file name that ends with .txt, regardless of the case. The loop body simply prints the value of the variable file, which holds the name of the current file in each iteration. Therefore, the output of the shell script would be the names of the files that end with .txt, one per line. In this case, the files are A.txt and b.txt, so the output would be:
A .txt b.txt
This corresponds to option E. The other options are incorrect for the following reasons:
Option A: *.txt is not the output of the shell script, but the pattern that the loop uses to match the files. The shell expands the pattern to the actual file names before executing the loop.
Option B: a and b are not the names of the files, but the first characters of the file names. The loop prints the whole file name, including the extension.
Option C: c.cav is not a file that matches the pattern *.txt, because it has a different extension. The loop ignores files that do not end with .txt.
Option D: A.txt is only one of the files that matches the pattern *.txt, but not the only one. The loop prints both A.txt and b.txt.
NEW QUESTION # 70
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