Linux

Question 1

Displays the path of the current directory on screen.

Answer 1

pwd (print working directory)

Question 2

Displays the IP address and the subnet mask assigned to this system.

Answer 2

ifconfig

Question 3

Displays a list of files and subdirectories that exist within a directory.

• a (displays all files, including hidden files)
• l (displays a detailed (long) listing of directory contents)
• R (displays the contents of the directory and all of its subdirectories)

Answer 3

ls

Question 4

Displays a brief summary of how to use the command.

Answer 4

–help

Question 5

Starts a new Bourne-again shell session.

Answer 5

bash

Question 6

Displays the manual page for a command. Use Q key to quit and go back to the shell prompt.

Answer 6

man

Question 7

Displays more extensive documentation about the command.

Answer 7

info

Question 8

Changes directories in the file system.

Answer 8

cd

Question 9

Copies files and directories from one location in the file system to another.

Answer 9

cp

Question 10

Moves and/or renames files and directories form one location or name to another.

Answer 10

mv

Question 11

Deletes files and directories form the file system.

Answer 11

rm

Question 12

Displays the contents of a text file on the screen.

Answer 12

cat

Question 13

Displays the contents of a text file on the screen, pausing the output one screen at a time.

Answer 13

less

Question 14

Displays the first few lines of a text file on the screen.

Answer 14

head

Question 15

Displays the last few lines of a text file on the screen.

Answer 15

tail

Question 16

Edits the contents of a text file. Uses four different operating modes:
Command mode
Command-line mode
Insert mode
Replace mode

Answer 16

vi

Question 17

Allows you to switch user accounts.

Answer 17

su

Question 18

Shuts down or reboots the system in a secure manner.
+m (specifies when to perform the shutdown operation. m is the amount of time in minutes)
-h (instructs the system to shut down and power down)
-r (instructs the system to reboot after the shutdown)
-p (powers off the machine)
message (specifies a message that is sent to all users that accompanies the standard shutdown notification.

Answer 18

shutdown