Question 1

Which of the following is not a communication command?
A)grep
B)mail
C)mesg
D)write

Accepted Answer

Grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. It is not used for communication between users, unlike mail, mesg, and write, which are used for sending messages and managing communication settings.

Question 2

What command is used with vi editor to move back to the beginning of a word?
A)w
B)e
C)a
D)b

Accepted Answer

The command 'b' is used in vi editor to move the cursor back to the beginning of a word.

Question 3

What command is used with vi editor to search a pattern in the forward direction?
A)(??)
B)(//)
C)(?)
D)(/)

Accepted Answer

The command used with vi editor to search a pattern in the forward direction is "/", where you type "/" followed by the pattern you're searching for.

Question 4

Which of the following is not a filter command?
A)sort
B)wc
C)grep
D)cat

Accepted Answer

The command "cat" is primarily used to concatenate and display the content of files, rather than filtering content based on specific criteria, unlike the other commands listed.

Question 5

While executing a command, the shell
A)Executes it in the same process (as shell)
B)Creates a child shell to execute it
C)Loads a special program to take care of the execution
D)None of the mentioned

Accepted Answer

When the shell executes a command, it typically forks a child process for the command to run in, ensuring that the main shell process remains available and unaffected by the execution of the command.

Question 6

Which variable contains current shell process id
A)$*
B)$?
C)$$
D)$!

Accepted Answer

The variable that contains the current shell process ID is `$$`.

Question 7

Hidden files are
A)Those whose 'read' bit is set to 'h'
B)Permitted for (can be accessed) only superusers
C)Files that begin with a '.'
D)Files that cannot be opened by ordinary user for writing

Accepted Answer

Hidden files in Unix-like operating systems, such as Linux and macOS, are typically those whose filenames begin with a dot ('.'). This convention signals to the system and many applications that the file is not to be displayed by default when listing directory contents, although it can be revealed through specific commands or options (e.g., 'ls -a'). The other options do not accurately describe what makes a file hidden.

Question 8

Shell is ?
A)Command Interpreter
B)Interface between Kernel and Hardware
C)Interface between user and applications
D)Command Compiler

Accepted Answer

Shell acts as a command interpreter, translating commands entered by the user into actions performed by the operating system. It does not compile commands, nor does it serve as an interface between the kernel and hardware or between the user and applications directly.

Question 9

Which command searches the string in file opened in vi editor?
A)/ or ?
B)f or F
C)t or T
D)none of the mentioned

Accepted Answer

The commands "/" and "?" are used in vi/vim editor to search for a string forward and backward, respectively.

Question 10

Which command sets the number for all lines?
A):set li
B):set ln
C):set nu
D):set nl

Accepted Answer

The correct command to set the number for all lines in Vim (a highly configurable text editor) is `:set nu` or `:set number`. This command enables line numbering, making it easier to navigate through the text.

Question 11

Which of the following is true?
A)Shell is a process and can be started by superuser only
B)Shell is a built-in Kernel functionality
C)Shell is a wrapper for all the commands and utilities
D)None of the mentioned

Accepted Answer

Shell acts as an interface between the user and the kernel, allowing users to execute commands, run programs, and manage system resources. It is not limited to superusers, is not a built-in part of the kernel, and is more accurately described as a command interpreter or a program that provides a user interface.

Question 12

The permission -rwxr-r- represented in octal expression will be
A)777
B)666
C)744
D)711

Accepted Answer

The octal expression for -rwxr-r- is 744, where 'r' (read) is 4, 'w' (write) is 2, and 'x' (execute) is 1. Adding these values for each user category (owner, group, others) gives 7 (rwx=4+2+1), 4 (r--=4+0+0), and 4 (r--=4+0+0).

Question 13

Effective group id can be set using following permission
A)0777
B)2666
C)4744
D)1711

Accepted Answer

The answer of Effective group id can be set using...

Question 14

The permission -rwSr-r- represented in octal expression will be
A)0777
B)2666
C)4744
D)4644

Accepted Answer

The permission -rwSr-r- represented in octal expression will be 4644.The first digit represents the permissions for the owner, the second digit represents the permissions for the group, and the third digit represents the permissions for others.The owner has read, write, and execute permissions, which is represented by the number 7 in octal.The group has read and execute permissions, which is represented by the number 6 in octal.Others have only read permissions, which is represented by the number 4 in octal.Therefore, the octal representation of the permission -rwSr-r- is 4644.

Question 15

Which of the following umask settings doesn't allow execute permission to be set by default on directory files
A)222
B)111
C)000
D)444

Accepted Answer

umask 000 allows all permissions to be set by default, including execute permission on directory files.

Question 16

Write the command to display the current date in the form dd/mm/yyyy.
A)date +%d/%m/%Y
B)date +"%d/%m/%Y"
C)date +/%d/%m/20%y
D)date +"/%d/%m/20%y"

Accepted Answer

The correct command is "date +%d/%m/%Y". This command uses the "+%d/%m/%Y" format specifier to display the current date in the form dd/mm/yyyy.

Question 17

How to execute ls command inside a vi editor?
A)!ls
B):ls
C):!ls
D)we can't execute

Accepted Answer

C) :!ls allows you to execute shell commands from within vi, including the ls command.

Question 18

What communication command provides communication to another user logged on by writing to the bottom of their terminal?
A)talk
B)write
C)chat
D)tr

Accepted Answer

The answer of What communication command provides communication to another...

Question 19

Which of the following command output contains userid?
A)ls
B)help
C)date
D)ls -l

Accepted Answer

The command "ls -l" displays detailed information about files and directories, including the user ID (userid) of the file's owner.

Question 20

pwd command displays
A)user password
B)password file content
C)present working directory
D)none of the mentioned

Accepted Answer

The pwd command in Unix/Linux systems is used to print the present working directory.

Quiz 2: Unix Commands and Permissions

Which of the following is not a communication command?

What command is used with vi editor to move back to the beginning of a word?

What command is used with vi editor to search a pattern in the forward direction?

Which of the following is not a filter command?

While executing a command, the shell

Which variable contains current shell process id

Hidden files are

Shell is ?

Which command searches the string in file opened in vi editor?

Which command sets the number for all lines?

Which of the following is true?

The permission -rwxr-r- represented in octal expression will be

Effective group id can be set using following permission

The permission -rwSr-r- represented in octal expression will be

Which of the following umask settings doesn't allow execute permission to be set by default on directory files

Write the command to display the current date in the form dd/mm/yyyy.

How to execute ls command inside a vi editor?

What communication command provides communication to another user logged on by writing to the bottom of their terminal?

Which of the following command output contains userid?

pwd command displays