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| Section | Objectives |
|---|---|
| Topic 1: Security and File Permissions | - Basic Security Concepts - File Permissions and Ownership - Users and Groups |
| Topic 2: The Power of the Linux Command Line | - Introduction to Shell and Scripting Concepts - Working with Text Streams - Basic Commands and Utilities |
| Topic 3: Finding Your Way on a Linux System | - File and Directory Operations - Command Line Basics - Filesystem Navigation |
| Topic 4: The Linux Operating System | - Package Management Basics - Operating System Components - Processes and System Resources |
| Topic 5: The Linux Community and a Career in Open Source | - Open Source Software and Licensing - Linux Evolution and Popular Operating Systems - Major Open Source Applications - ICT Skills and Working in Linux |
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質問 # 42
Which of the following statements is true about Free Software?
正解：E
解説：
The correct statement about Free Software is that it may be modified by anyone using it. This is one of the four essential freedoms of Free Software, which are: the freedom to run the program as you wish, for any purpose; the freedom to study how the program works, and change it so it does your computing as you wish; the freedom to redistribute copies so you can help your neighbor; and the freedom to distribute copies of your modified versions to others1. Access to the source code is a precondition for these freedoms1.
The other statements are false for the following reasons:
Free Software is not developed by volunteers only. It can be developed by anyone, including individuals, companies, organizations, or communities. Some Free Software developers are paid for their work, while others do it as a hobby or for social benefit1.
Free Software does not have to be available free of charge. It can be sold or given away for any price. The term "free" refers to the users' freedom, not the price of the software1. However, Free Software users have the freedom to redistribute copies, so they can obtain the software at no charge from someone who has a copy1.
Free Software does not only run on Linux. It can run on any operating system that supports it, such as Windows, MacOS, BSD, or Android. Linux is an example of a Free Software operating system, but not the only one1.
Free Software is not only distributed as a compiled binary. It can also be distributed as source code, or both. In fact, Free Software must provide access to the source code, otherwise the users cannot study or modify the software1.
Reference:
What is Free Software? - GNU Project - Free Software Foundation
質問 # 43
Which of the following commands will search for the file foo.txt under the directory /home?
正解：B
解説：
The correct command to search for the file foo.txt under the directory /home is find /home -name foo.txt. This command uses the find command, which is used to search for files and directories that match certain criteria. The first argument, /home, specifies the starting point of the search. The second argument, -name, indicates that the search is based on the name of the file or directory. The third argument, foo.txt, is the name of the file to be searched for. The find command will recursively search all the subdirectories under /home and print the path of any file or directory that matches the name foo.txt.
The other commands are incorrect for various reasons:
A). search /home -file foo.txt is incorrect because there is no such command as search in Linux. The correct command for searching files and directories is find.
B). search /home foo.txt is incorrect because, as mentioned above, there is no search command in Linux. Also, this command does not use any option to specify the search criteria, such as -name, -type, -size, etc.
C). find /home - file foo.txt is incorrect because the option -file is not valid. The correct option for specifying the type of file or directory is -type, followed by a letter that indicates the type, such as f for regular file, d for directory, l for symbolic link, etc. For example, find /home -type f -name foo.txt would search for a regular file named foo.txt under /home.
E). find /home foo.txt is incorrect because this command does not use any option to specify the search criteria, such as -name, -type, -size, etc. This command will search for any file or directory that has foo.txt as part of its name, not exactly as its name. For example, this command will also match a file named barfoo.txt or a directory named foo.txt.bak.
質問 # 44
Which of the following outputs comes from the commandfree?
正解：D
質問 # 45
What information can be displayed by top?
正解：C
解説：
The top command is a Linux command that shows the running processes on the system. It provides a dynamic real-time view of the system performance and resource usage. The top command can display various information about the processes, such as their process ID, user, priority, state, CPU and memory usage, command name, and more. The top command can also sort the processes by different criteria, such as CPU or RAM consumption, by using the interactive commands. The top command is useful for monitoring the system load and identifying the processes that are consuming the most resources. Reference:
Linux Essentials Topic 104: The Linux Operating System, section 104.3: Basic features and commands of the Linux standard shells.
Linux Essentials Topic 106: Security and File Permissions, section 106.4: Monitor and manage Linux processes.
質問 # 46
Which of the following examples shows the general structure of a for loop in a shell script?
正解：C
解説：
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
質問 # 47
......
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