Unix MCQ (Multiple Choice Questions)

Here are 1000 MCQs on Unix (Chapterwise).

1. What is Unix?
a) Unix is a programming language
b) Unix is a software program
c) Unix is an operating system
d) Unix is a text editor
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2. The Unix shell is both _______ and _______ language.
a) scripting, interpreter
b) high level, low level
c) interactive, responsive
d) interpreter, executing
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3. In which language UNIX is written?
a) C++
b) C
c) JAVA
d) Python
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4. Which of the following is the first UNIX editor?
a) vi
b) emacs
c) ex
d) ed
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5. Which of the following is not a feature of Unix?
a) multiuser
b) easy to use
c) multitasking
d) portability
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6. Which of the following is not true about Unix?
a) UNIX was not written in ‘C’ language
b) Linux is also known as a version of UNIX
c) A user can run multiple programs at the same time; hence UNIX is called a multitasking environment
d) Many people can use a UNIX based computer at the same time; hence UNIX is called as a multiuser system
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7. Which editor is used by the Unix system to edit files?
a) word
b) notepad++
c) vi
d) notepad
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8. Which of the following is not a part of all the versions of Unix?
a) System Calls
b) Graphical user interface
c) Kernel and Shell
d) Commands and utilities
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9. Which part of the Unix operating system interacts with the hardware?
a) Application program
b) Vi editor
c) Shell
d) Kernel
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10. Which command is used to display the documentation of commands in Unix?
a) man
b) whatis
c) help
d) search
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11. Which Unix command is used for changing the current directory?
a) pwd
b) rm
c) cd
d) cp
View Answer

$ cd dir_one
$pwd
/bin/user06/dir_one

12. Which command is used for printing the current working directory?
a) dir
b) HOME
c) cd
d) pwd
View Answer

$ pwd
/home/user06/Abdullah

13. Which command is used for listing files in a directory?
a) list
b) ls
c) wc
d) ps
View Answer

$ ls
001.sh        
FILE2       
abc.txt
dir08

14. Which command is used by the user to change their login password in Unix?
a) cp
b) man
c) reset
d) passwd
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15. Which command is used for displaying the contents of a file in Unix?
a) mkdir
b) cat
c) rm
d) cp
View Answer

$ cat abd.txt
HELLO WORLD

16. Which command is used to compress files?
a) gzip
b) gunzip
c) comm
d) cmp
View Answer

$ gzip  file01.txt

17. Which command is used for displaying the beginning of a file in Unix?
a) lp
b) begin
c) pr
d) head
View Answer

$ head emp.lst

18. Which symbol is used with the tail command to print the file from the selected line?
a) %%
b) ^
c) +
d) –
View Answer

$ tail +11 emp.lst        // start printing from 11th line onwards

19. Which command is used to delete all files in a directory?
a) del *
b) rm *
c) mv *
d) rmdir *
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20. echo command is used for _________
a) displaying diagnostic messages
b) displaying date and time
c) displaying errors
d) displaying operating system details
View Answer

$ echo hello
hello

21. What is the function of cp command in Unix?
a) delete a given file
b) change the directory
c) list all the available files in the current directory
d) cp is a command used for copying files and directories
View Answer

$ cp  file_01  file_02               // copies file_01 to file_02

22. Which command is used for removing/deleting files in Unix?
a) rm
b) mv
c) rmdir
d) del
View Answer

$ rm  abd.txt

23. Which command is used for renaming files in Unix?
a) rename
b) move
c) mv
d) cp
View Answer

$ mv  file1  file2

24. Which command is used for comparing two files?
a) comp
b) cmp
c) comm
d) diff
View Answer

$ cmp  file01  file02
file01  file02 differ: Byte 20, Line 2

25. Which Unix command is used for counting words, lines, and characters in a file?
a) wc
b) man
c) count
d) diff
View Answer

$ wc file01
3   9   45  file01

26. In UNIX, which command is used to change the permissions of a file?
a) chown
b) chgrp
c) chmod
d) ch
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27. Which symbol is used to change permissions for hidden files in Unix?
a) *
b) $
c) &
d) .
View Answer

 
$ chmod 755  .    // works on hidden files

28. Which command is used for saving and quitting the vi editor simultaneously?
a) ‘:x’
b) :f
c) :q
d) :w
View Answer

29. How can we escape to the UNIX shell without quitting vi editor?
a) using ‘:sh’ command and using ctrl-Z
b) using ‘:sh’ command
c) using ctrl-Z
d) using ctrl-D
View Answer

30. For creating and removing directories, which of the following system calls are used?
a) mkdir and rmdir
b) rmdir and chown
c) chdir and chown
d) mkdir and chdir
View Answer

31. Which of the following files are known as special files in Unix?
a) /dev/null
b) sample.txt
c) /dev/null and /dev/tty
d) /dev/tty
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32. What is the output of the following Unix command?

$ wc  -c  *.c

a) size of each .c file
b) total size of .c files
c) erroneous
d) undefined
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33. In Unix, for what purpose bc command is used?
a) for copying files
b) as a process table viewer
c) as an editor
d) as a calculator
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34. Which process is immediately set up by the kernel when we log on to a Unix system?
a) System
b) bash
c) shell
d) parent
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35. Which command shows some attributes of a process?
a) HOME
b) ps
c) $$
d) pid
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36. Which of the following system call is used for creating a new process in Unix?
a) new
b) wait
c) read
d) fork
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37. Which of the following command is used to create a child shell?
a) sh
b) env
c) wait
d) fork
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38. Which Unix command is used for locating files?
a) type
b) loc
c) find
d) search
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39. Which command is used for preparing a file for printing?
a) pr
b) print
c) cat
d) cd
View Answer

$ pr  dept.lst
May  06  10:38  1998  dept.lst  Page 1
01:accounts:6213
02:admin:5423
03:marketing:6521
04:personnel:2365
 
.....blank lines.......

40. Which command is used for sorting a file on specified fields?
a) pr
b) cut
c) tail
d) sort
View Answer

$ sort emp.lst

41. Which Unix command is used for locating repeated and non-repeated lines?
a) cut
b) paste
c) uniq
d) sort
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42. Which command is used for translating characters?
a) paste
b) tr
c) trans
d) sort
View Answer

$ tr  options  expression1  expression2  standard input

43. Which of the following command will be used for searching “director” in emp.lst?
a) grep “director” emp.lst
b) grep -director emp.lst
c) grep -v “director” emp.lst
d) grep “director”
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44. Which of the following command is used for searching for a pattern in one or more file(s)?
a) paste
b) grep
c) cd
d) cp
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45. Which of the following commands is known as stream editor?
a) grep
b) tr
c) sed
d) td
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46. What is a shell script?
a) group of functions
b) a file containing a series of commands
c) a file containing special symbols
d) group of commands
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47. To run the script, we should make it executable first by using _____
a) chmod +w
b) chmod +rwx
c) chmod +x
d) chmod +r
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48. Which command is used for acquiring superuser status?
a) su
b) pu
c) super
d) admn
View Answer

$ su
Password: *****        //root’s password
#pwd
/home/abd             //prompt changes ( super user mode)

49. Which command is used to find out the consumption of a specific directory?
a) mem
b) dv
c) du
d) df
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50. Which filter apart from perl, is the most powerful?
a) awk
b) grep
c) cut
d) sed
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51. For running a Unix command within awk, we’ve to use ____ function.
a) split
b) system
c) substr
d) length
View Answer

BEGIN 
{
      system(“date”)   // prints the system date 
}

52. To extract specific columns from a file ____ command is used.
a) cut
b) pr
c) head
d) tail
View Answer

$ cut  -c  6-22,24-32  emp.lst

53. Which of the following cannot be performed by cat command?
a) appending files
b) deleting files
c) creating files
d) displaying files
View Answer

54. What is the default delimiter used by the cut command for cutting fields?
a) underscore
b) space
c) tab
d) double tab
View Answer

55. Which of the following is not an internal command used by mailx?
a) d
b) N
c) a
d) q
View Answer

N , prints the message numbered N
d , deletes the current message( if N is not specified along with it)
q , quits the mailx  program

1. Unix Architecture & General Purpose Utilities
2. File System
3. Handling Ordinary Files
4. Basic File Attributes
5. Vi Editor
6. Shell
7. Process
8. Customizing the Environment & More File Attributes
9. Simple Filters
10. Filters using Regular Expressions
11. Essential Shell Programming
12. Awk – An Advanced Filter & Perl – Master Manipulator
13. Advanced Vi
14. System Programming – Files
15. Process Control & Unix System Performance

Best Books on Unix:

• Unix Books
• Unix and Shell Programming Books
• Unix System Programming Books
• Unix Environment Books

Unix Online Tests:

• Unix Tests
• Unix Certification Test
• Unix Internship Test
• Unix Job Test
• Unix Qualifier Test
• Unix Top Rankers
• Unix Practice Test – Set 1
• Unix Practice Test – Set 2
• Unix Practice Test – Set 3
• Unix Practice Test – Set 4
• Unix Practice Test – Set 5
• Unix Practice Test – Set 6
• Unix Practice Test – Set 7
• Unix Practice Test – Set 8
• Unix Practice Test – Set 9
• Unix Practice Test – Set 10
• Unix Mock Test – Set 1
• Unix Mock Test – Set 2
• Unix Mock Test – Set 3
• Unix Mock Test – Set 4
• Unix Mock Test – Set 5
• Unix Mock Test – Set 6
• Unix Mock Test – Set 7
• Unix Mock Test – Set 8
• Unix Mock Test – Set 9
• Unix Mock Test – Set 10

Important Links:

• Operating System Multiple Choice Questions
• Linux Multiple Choice Questions
• Computer Science Multiple Choice Questions