PROBLEM 2: Commands

1. What are Commands?

a) specific instructions for performing a particular task

b) part of the operating system

c) part of the shell

d) special instructions

Answer

2. In how many categories, commands of UNIX operating system classified?

a) 1

b) 2

c) Many

d) 0

Answer:

.

3. Which command is used for extracting the details of the operating system?

a) cd

b) echo

c) uname

d) wc

Answer:

4. The sequences of directories that a shell searches while looking for a command is specified in the PATH variable.

a) True

b) False

Answer:

5. Options are also arguments but begin with a -.

a) True

b) False

Answer:

6. Which of the following is not a valid option of uname?

a) -a

b) -s

c) -v

d) -z

Answer:

.

7. How can we specify more than one command in the command line at the same time?

a) using ;

b) using >

c) using ==

d) not possible

Answer:

8. Which command is used to display the documentation of commands in UNIX?

a) help

b) search

c) whatis

d) man

Answer:

9. Which command is used for displaying date and calendar in UNIX?

a) date and cal

b) DATE and CAL

c) date and calendar

d) dt and cl

Answer:

10. What is the output of who command?

a) display information about users who are currently logged in.

b) display file hierarchy

c) display administrator information

d) display processes

Answer:

11. What are meta-characters?

a) special characters having predefined meaning to the shell

b) special symbols

c) shell symbols

d) command symbols

Answer:

12. Which command is used for displaying date in the format dd/mm/yyyy ?

a) date +%m

b) date +%h

c) date +%d/%m/%Y

d) date +%h %m

Answer: