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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: The Power of the Command Line | 40% | - Pipes, Redirection and Variables
|
| Topic 2: The Linux Operating System | 20% | - Where Data is Stored
|
| Topic 3: Security and File Permissions | 13% | - Basic Security and User Types
|
| Topic 4: The Linux Community and a Career in Open Source | 7% | - Open Source Applications
|
| Topic 5: Finding Your Way on a Linux System | 20% | - Command Line Basics
|
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NEW QUESTION # 31
Which of the following commands output the content of the file Texts 2.txt? (Choose two.)
Answer: B,D
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'
NEW QUESTION # 32
Which of the following statements is true about Free Software?
Answer: B
NEW QUESTION # 33
What is true about the owner of a file?
Answer: E
Explanation:
Explanation
In Linux, every file and directory is associated with an owner and a group. The owner is the user who created the file or directory, and the group is the group to which the owner belongs. Therefore, each file is owned by exactly one user and one group. This is true for option A. The other options are false for the following reasons:
* Option B: The owner of a file does not always have full permissions when accessing the file. The permissions are determined by the file mode, which can be changed by the owner or the root user. The file mode specifies the read, write, and execute permissions for the owner, the group, and others. The owner can have different permissions than the group or others.
* Option C: The user owning a file does not have to be a member of the file's group. The owner can change the group ownership of the file to any group on the system, regardless of whether the owner belongs to that group or not. However, only the root user or a user with the CAP_CHOWN capability can change the group ownership to a group that the owner is not a member of.
* Option D: When a user is deleted, all files owned by the user do not disappear. The files remain on the system, but their owner is changed to an invalid user ID (UID). The files can still be accessed by the group or others, depending on the permissions. The files can also be reclaimed by the root user or a user with the CAP_CHOWN capability, who can change the owner to a valid user.
* Option E: The owner of a file can be changed once it is assigned to an owner. The owner can transfer the ownership to another user, or the root user or a user with the CAP_CHOWN capability can change the owner to any user on the system. The command to change the owner of a file is chown. References: 1: Chown Command in Linux (File Ownership) | Linuxize 2 3: Linux File Permissions and Ownership Explained with Examples 4 2: 3 Ways to Find File Owner in Linux - howtouselinux 1
NEW QUESTION # 34
What is true about a recursive directory listing?
Answer: C
Explanation:
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 inthe 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 ofthe 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 References: 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 # 35
Which one of the following is true about Open Source software?
Answer: B
NEW QUESTION # 36
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