RH033 Red Hat Linux Essentials - Practice Questions

Question 1

CORRECT TEXT

Which of the following commands are used to put (paste) data from a buffer into a document in vim?

Each correct answer represents a complete solution. Choose two.

A :set

B. p

C. P

D. ps

Answer: BC

Explanation:

The commands to put data from a buffer into the document are p and P. p puts the data below the current line and P puts the data above the current line.

What is the p command?

The p command is used to put (paste) data from a buffer into the document. If data is line oriented

(a line or a paragraph), the p command will open a new line below the current line and place the data on this line. If data is character oriented (a letter, word, or sentence), the p command will place the data after the cursor.

What is the P command?

The P command is used to put data from a buffer into a document. How this command works depends on the nature of the data in the buffer. If the data is line oriented, the P command will open a new a line above the current line and paste the data there. If the data is character oriented, the P command will put the data before the cursor. Answer option D is incorrect. The ps command displays the status of the current processes in Linux. Answer option A is incorrect. The :set command lists a small number of important configuration items in vim.

Select all that apply, then click Submit answer.

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p
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P
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ps

Question 2

Which of the following information does the /etc/passwd file contain? Each correct answer represents a complete solution. Choose all that apply.

Select all that apply, then click Submit answer.

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Numerical group ID
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User name
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Shadow password
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Numerical user ID
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Reserved gecos ID
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User's home directory

Reference / correct answer:

Numerical group ID

User name

Numerical user ID

Reserved gecos ID

User's home directory

All these information are stored in the /etc/passwd file.

What is the /etc/passwd file?

In Linux operating systems, the /etc/passwd file lists information about each of the users that may login to the system. The file is so named because originally it also contained the data used to verify passwords. However, on modern Unix systems, the security-sensitive password information is instead often stored in a different file using shadow passwords.

The /etc/passwd file typically has world-readable permissions, though it may only be edited by the superuser or by using a few special purpose commands.

The first field is the user name. Each record in the file must have a unique user name field. The second field stores information used to confirm a user's password; however, in most modern uses, this field is usually set to "x" (or some other indicator) with the actual password information being stored in a separate shadow password file.

The third field is the user identifier, the number that the operating system uses for internal purposes. It does not have to be unique.

The fourth field is the group identifier. This number identifies the primary group of the user; all files that are created by this user will initially belong to this group.

Reserved gecos ID (Typically, this is a set of comma-separated values including the user's full name and contact details).

The sixth field is the path to the user's home directory.

The seventh field is the shell program that is started every time the user logs into the system.

Answer option C is incorrect. The shadow password is stored in the /etc/shadow file.

What is /etc/shadow file?

The /etc/shadow file stores the account information in the following format:

Question 3

Which of the following statements are true about file permissions?

Each correct answer represents a complete solution. Choose three.

Select all that apply, then click Submit answer.

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The execute permission means that the file can be run if it is a program or script.
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The write permission means that the file can be edited and saved.
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The read permission means that only the file name can be read not the contents of the file.
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The read permission means that the contents of the file can be seen with a command such as cat or less.

RH033 – Red Hat Linux Essentials