Linux Skills Assessment - Mop-centric

1. Which command below would list the contents of your current working directory?

Show

Dir

Ls

List

The "ls" command is used in Unix-based systems to list the contents of the current working directory. It is the equivalent of the "dir" command in Windows. Therefore, selecting "ls" as the answer would display the contents of the current working directory.

Explanation

The "ls" command is used in Unix-based systems to list the contents of the current working directory. It is the equivalent of the "dir" command in Windows. Therefore, selecting "ls" as the answer would display the contents of the current working directory.

2. What is a "man" page?

The front page of the Sports section.

Directs you to use the white courtesy phone at the airport.

A page detailing the usage and syntax of a particular Linux command.

A page which describes how to manually perform tasks.

A "man" page refers to a page that provides detailed information about the usage and syntax of a specific Linux command. It serves as a manual or documentation resource for users, helping them understand how to effectively utilize the command and its various options. This page typically includes descriptions, examples, and other relevant details to assist users in performing tasks using the specific command.

Explanation

A "man" page refers to a page that provides detailed information about the usage and syntax of a specific Linux command. It serves as a manual or documentation resource for users, helping them understand how to effectively utilize the command and its various options. This page typically includes descriptions, examples, and other relevant details to assist users in performing tasks using the specific command.

3. Which command below would change your location to the "/tmp" directory?

Cd /tmp

Cd C:\tmp

Mvdir /tmp

Cd tmp

The correct answer is "cd /tmp". This command is used to change the current directory to the "/tmp" directory. The "cd" command stands for "change directory" and the "/tmp" specifies the directory path. By entering this command, the user's location will be changed to the "/tmp" directory.

Explanation

The correct answer is "cd /tmp". This command is used to change the current directory to the "/tmp" directory. The "cd" command stands for "change directory" and the "/tmp" specifies the directory path. By entering this command, the user's location will be changed to the "/tmp" directory.

4. The "sed" command can be used to manipulate text strings in a file or files, without having to edit the file manually. You are in a directory containing dozens of files., Some filesnames end with the .txt extension and some with the .cfg extension. You want to replace the string "foo" with the string "bar" in every file ending in .txt using only one command. Which command below would accomplish that?

Sed -i "s/foo/bar"

Sed -s "i/foo/bar/"

Sed -i "s/foo/bar/" *.txt

Sed -i "s/foo/bar/" *.*

The correct answer is "sed -i "s/foo/bar/" *.txt" because the command uses the sed utility with the -i flag to edit files in-place, meaning it will modify the files directly without creating backup files. The "s/foo/bar/" argument is the substitution command, which replaces the string "foo" with "bar". The "*.txt" specifies that the command should only be applied to files with the .txt extension.

Explanation

The correct answer is "sed -i "s/foo/bar/" *.txt" because the command uses the sed utility with the -i flag to edit files in-place, meaning it will modify the files directly without creating backup files. The "s/foo/bar/" argument is the substitution command, which replaces the string "foo" with "bar". The "*.txt" specifies that the command should only be applied to files with the .txt extension.

5. Which command below displays your current working directory?

Dir

Pwd

Ls

Whereami

Cwd

The command "pwd" stands for "print working directory" and is used to display the current working directory in a command line interface. It is commonly used in Unix-like operating systems, including Linux and macOS. By executing the "pwd" command, the user can easily identify the directory they are currently located in within the file system hierarchy.

Explanation

The command "pwd" stands for "print working directory" and is used to display the current working directory in a command line interface. It is commonly used in Unix-like operating systems, including Linux and macOS. By executing the "pwd" command, the user can easily identify the directory they are currently located in within the file system hierarchy.

6. Which command shows information about a Linux machine's filesystems and filesystem free space?

Du -k

Df -k

Showmount

Ls -lart

The "df -k" command is used to display information about the filesystems on a Linux machine, including their sizes and the amount of free space available. The "-k" option is used to display the sizes in kilobytes. This command is commonly used to check the disk space usage on a system.

Explanation

The "df -k" command is used to display information about the filesystems on a Linux machine, including their sizes and the amount of free space available. The "-k" option is used to display the sizes in kilobytes. This command is commonly used to check the disk space usage on a system.

7. How can you show a list of your previously entered commands, filtered for the string "service"? (Multiple correct answers, choose ALL that apply)

Cat ~/.bash_history | grep service

Last | service

History | grep service

Sometimes a | is just a |

The correct answers are "cat ~/.bash_history | grep service" and "history | grep service".

1. "cat ~/.bash_history | grep service" uses the "cat" command to display the contents of the "~/.bash_history" file, which contains a list of previously entered commands. The "|" (pipe) symbol is used to redirect the output of "cat" to the "grep" command, which filters the output for the string "service".

2. "history | grep service" uses the "history" command to display a list of previously entered commands. The "|" (pipe) symbol is used to redirect the output of "history" to the "grep" command, which filters the output for the string "service".

Explanation

The correct answers are "cat ~/.bash_history | grep service" and "history | grep service".

1. "cat ~/.bash_history | grep service" uses the "cat" command to display the contents of the "~/.bash_history" file, which contains a list of previously entered commands. The "|" (pipe) symbol is used to redirect the output of "cat" to the "grep" command, which filters the output for the string "service".

2. "history | grep service" uses the "history" command to display a list of previously entered commands. The "|" (pipe) symbol is used to redirect the output of "history" to the "grep" command, which filters the output for the string "service".

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8. Which command(s) below can you use to reboot the machine? (Multiple correct answers, choose ALL that apply)

Reboot

Restart

Shutdown -r now

Shutdown -h now

Init 6

The command "reboot" can be used to reboot the machine. The command "shutdown -r now" can also be used to reboot the machine. Additionally, the command "init 6" can be used to reboot the machine.

Explanation

The command "reboot" can be used to reboot the machine. The command "shutdown -r now" can also be used to reboot the machine. Additionally, the command "init 6" can be used to reboot the machine.

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9. Which command(s) below can you use to determine which user you are logged in as? (Multiple correct answers, choose ALL that apply)

Echo $user

Showme

Whoami

Id

Showuser

The command "echo $user" can be used to determine which user you are logged in as. The command "whoami" can also be used for the same purpose. Additionally, the command "id" can be used to determine the user's identity.

Explanation

The command "echo $user" can be used to determine which user you are logged in as. The command "whoami" can also be used for the same purpose. Additionally, the command "id" can be used to determine the user's identity.

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10. Which command(s) below can you use to view the contents of a text file? (Multiple correct answers, choose ALL that apply)

Cat

Less

More

Show

Vi

View

Print

You can use the "cat" command, the "less" command, the "more" command, the "vi" command, and the "view" command to view the contents of a text file. The "cat" command displays the entire contents of the file, the "less" command allows you to scroll through the file, the "more" command displays the file one screen at a time, the "vi" command opens the file in a text editor where you can view and edit the contents, and the "view" command is similar to "vi" but it only allows you to view the file without editing it.

Explanation

You can use the "cat" command, the "less" command, the "more" command, the "vi" command, and the "view" command to view the contents of a text file. The "cat" command displays the entire contents of the file, the "less" command allows you to scroll through the file, the "more" command displays the file one screen at a time, the "vi" command opens the file in a text editor where you can view and edit the contents, and the "view" command is similar to "vi" but it only allows you to view the file without editing it.

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