Linux OS Shell Interview Questions And Answers

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Prepare comprehensively for your Linux Shell interview with our extensive list of 53 questions. These questions will test your expertise and readiness for any Linux Shell interview scenario. Ideal for candidates of all levels, this collection is a must-have for your study plan. Download the free PDF now to get all 53 questions and ensure you're well-prepared for your Linux Shell interview. This resource is perfect for in-depth preparation and boosting your confidence.

53 Linux Shell Questions and Answers:

Linux Shell Job Interview Questions Table of Contents:

Linux Shell Job Interview Questions and Answers

1 :: The statement z = 'expr 5 / 2′ would store which of the following values in z?
a) 0
b) 1
c) 2
d) 2.5
e) 3

c) 2

2 :: What is the output of the following program?

[ -n $HOME ]
echo $?
[ -z $HOME ]
echo $?
a) 0
1
b) 1
0
c) 0
0
d) 1
1

a) 0
1

3 :: What is the output of the following program?

x = 3; y = 5; z = 10;
if [( $x -eq 3 ) -a ( $y -eq 5 -o $z -eq 10 )]
then
echo $x
else
echo $y
fi
a) 1
b) 3
c) 5
d) Error

b) 3

4 :: The expression expr -9 % 2 evaluates to:
a) 0
b) 1
c) -1
d) 2

c) -1

5 :: What is the output of the following program?

b =
[ -n $b ]
echo $?
[ -z $b ]
echo $?
a) 1
1
b) 2
2
c) 0
0
d) 0
1

c) 0
0

6 :: What is the output of the following code:

os=Unix
echo 1.$os 2."$os" 3.'$os' 4.$os

a) 1.Unix 2.Unix 3.Unix 4.Unix
b) 1.Unix 2.Unix 3.$os 4.Unix
c) 1.Unix 2.Unix 3.Unix 4.$os
d) 1.Unix 2.$os 3.$os 4.$os

b) 1.Unix 2.Unix 3.$os 4.Unix

7 :: Create a new file "new.txt" that is a concatenation of "file1.txt" and "file2.txt"?
a) cp file.txt file2.txt new.txt
b) cat file1.txt file2.txt > new.txt
c) mv file[12].txt new.txt
d) ls file1.txt file2.txt | new.txt

b) cat file1.txt file2.txt > new.txt

8 :: What will be output of following command:
$ echo "The process id is" $$$$

a) The process id is $$
b) The process id is $<pid>$<pid>
c) The process id is <pid><pid>
d) The process id is $$$$

c) The process id is <pid><pid>

9 :: What is the return value ($?) of this code:

os = Unix
[$osName = UnixName] && exit 2
[${os}Name = UnixName] && exit 3

a) 0
b) 1
c) 2
d) 3

d) 3

10 :: Which of these is not a valid variable in bash:
a) __ (double underscore)
b) _1var (underscore 1 var )
c) _var_ (underscore var underscore)
d) some-var (some hyphen var)

d) some-var (some hyphen var)

11 :: How do you print the lines between 5 and 10, both inclusive?
a) cat filename | head | tail -6
b) cat filename | head | tail -5
c) cat filename | tail +5 | head
d) cat filename | tail -5 | head -10

a) cat filename | head | tail -6

12 :: What would be the current working directory at the end of the following command sequence?

$ pwd
/home/user1/proj
$ cd src
$ cd generic
$ cd .
$ pwd
a) /home/user1/proj
b) /home/user1/proj/src
c) /home/user1
d) /home/user1/proj/src/generic

d) /home/user1/proj/src/generic

13 :: Tell me which of the following commands allows definition and assignment of environment variables under bash:
a) env
b) export
c) environ
d) setenviron

a) env

14 :: How to feed standard output of one command to standard input of another in a single shell session?
a) IO redirection can be used
b) Named pipes can be used
c) The pipe operator provided by the shell can be used
d) It can not be done

c) The pipe operator provided by the shell can be used

15 :: The redirection 2> abc implies:
a) Write file 2 to file abc
b) Write standard output to abc
c) Write standard error to abc
d) none of the mentioned

c) Write standard error to abc

16 :: cmd > abc 2>&1 will:
a) Write file2 to file1
b) Write standard output and standard error to abc
c) Write standard error to abc
d) Write standard output to abc & standard error to monitor

b) Write standard output and standard error to abc

17 :: cmd 2>&1 > abc will:
a) Write file2 to file1
b) Write standard output and standard error to abc
c) Write standard error to abc
d) Write standard output to abc & standard error to monitor

d) Write standard output to abc & standard error to monitor

18 :: The following commands gives the output like this:
#cat file1 file2
#cat: file1: No such file or directory
hello
If we execute the command "cat file1 file2 1>2 2>&1" the output would be
a) cat: file1: No such file or directory hello
b) No output is displayed
c) Cat: 1>2: No such file or directory
d) hello

b) No output is displayed

19 :: From where would the read statement read if the following statements were executed?
exec < file1
exec < file2
exec < file3
read line
a) It would read all the files
b) It would not read any files
c) It would read all the files in reverse order
d) It would read only file3

b) It would not read any files

20 :: Which of these is the correct method for appending "foo" in /tmp/bar file?
a) echo foo > /tmp/bar
b) echo foo >> /tmp/bar
c) echo foo | /tmp/var
d) /tmp/bar < echo foo

b) echo foo >> /tmp/bar

21 :: cat < file1 >> file2 | file3:
a) file1 content will be appended to file2 and finally stored in file3
b) file1 content will be appended to file2 and file3 will be ignored
c) file2 and file3 will have same content
d) syntax error

d) syntax error

22 :: Executing cat /etc/password > /dev/sda as superuser will:
a) Write data into a regular file called /dev/sda
b) Write data to the physical device sda
c) Create a temporary file /dev/sda and write data to it
d) None of the above

b) Write data to the physical device sda

23 :: Which variable is used to display number of arguments specified in command line:
a) $0
b) $#
c) $*
d) $?

b) $#

24 :: Which variable contains last background job process id:
a) $*
b) $?
c) $$
d) $!

d) $!

25 :: Syntax to suppress the display of command error to monitor?
a) command > &2
b) command 2> &1
c) command 2> &2
d) command 2> /dev/null

d) command 2> /dev/null

Linux OS Shell Interview Questions And Answers

Download Linux Shell Interview Questions and Answers PDF

53 Linux Shell Questions and Answers:

Linux Shell Job Interview Questions Table of Contents:

1 :: The statement z = 'expr 5 / 2′ would store which of the following values in z? a) 0 b) 1 c) 2 d) 2.5 e) 3

2 :: What is the output of the following program? [ -n $HOME ] echo $? [ -z $HOME ] echo $? a) 0 1 b) 1 0 c) 0 0 d) 1 1

3 :: What is the output of the following program? x = 3; y = 5; z = 10; if [( $x -eq 3 ) -a ( $y -eq 5 -o $z -eq 10 )] then echo $x else echo $y fi a) 1 b) 3 c) 5 d) Error

4 :: The expression expr -9 % 2 evaluates to: a) 0 b) 1 c) -1 d) 2

5 :: What is the output of the following program? b = [ -n $b ] echo $? [ -z $b ] echo $? a) 1 1 b) 2 2 c) 0 0 d) 0 1

6 :: What is the output of the following code: os=Unix echo 1.$os 2."$os" 3.'$os' 4.$os a) 1.Unix 2.Unix 3.Unix 4.Unix b) 1.Unix 2.Unix 3.$os 4.Unix c) 1.Unix 2.Unix 3.Unix 4.$os d) 1.Unix 2.$os 3.$os 4.$os

7 :: Create a new file "new.txt" that is a concatenation of "file1.txt" and "file2.txt"? a) cp file.txt file2.txt new.txt b) cat file1.txt file2.txt > new.txt c) mv file[12].txt new.txt d) ls file1.txt file2.txt | new.txt

8 :: What will be output of following command: $ echo "The process id is" $$$$ a) The process id is $$ b) The process id is $<pid>$<pid> c) The process id is <pid><pid> d) The process id is $$$$

9 :: What is the return value ($?) of this code: os = Unix [$osName = UnixName] && exit 2 [${os}Name = UnixName] && exit 3 a) 0 b) 1 c) 2 d) 3

10 :: Which of these is not a valid variable in bash: a) __ (double underscore) b) _1var (underscore 1 var ) c) _var_ (underscore var underscore) d) some-var (some hyphen var)

11 :: How do you print the lines between 5 and 10, both inclusive? a) cat filename | head | tail -6 b) cat filename | head | tail -5 c) cat filename | tail +5 | head d) cat filename | tail -5 | head -10

12 :: What would be the current working directory at the end of the following command sequence? $ pwd /home/user1/proj $ cd src $ cd generic $ cd . $ pwd a) /home/user1/proj b) /home/user1/proj/src c) /home/user1 d) /home/user1/proj/src/generic

13 :: Tell me which of the following commands allows definition and assignment of environment variables under bash: a) env b) export c) environ d) setenviron

14 :: How to feed standard output of one command to standard input of another in a single shell session? a) IO redirection can be used b) Named pipes can be used c) The pipe operator provided by the shell can be used d) It can not be done

15 :: The redirection 2> abc implies: a) Write file 2 to file abc b) Write standard output to abc c) Write standard error to abc d) none of the mentioned

16 :: cmd > abc 2>&1 will: a) Write file2 to file1 b) Write standard output and standard error to abc c) Write standard error to abc d) Write standard output to abc & standard error to monitor

17 :: cmd 2>&1 > abc will: a) Write file2 to file1 b) Write standard output and standard error to abc c) Write standard error to abc d) Write standard output to abc & standard error to monitor

19 :: From where would the read statement read if the following statements were executed? exec < file1 exec < file2 exec < file3 read line a) It would read all the files b) It would not read any files c) It would read all the files in reverse order d) It would read only file3

20 :: Which of these is the correct method for appending "foo" in /tmp/bar file? a) echo foo > /tmp/bar b) echo foo >> /tmp/bar c) echo foo | /tmp/var d) /tmp/bar < echo foo

21 :: cat < file1 >> file2 | file3: a) file1 content will be appended to file2 and finally stored in file3 b) file1 content will be appended to file2 and file3 will be ignored c) file2 and file3 will have same content d) syntax error

22 :: Executing cat /etc/password > /dev/sda as superuser will: a) Write data into a regular file called /dev/sda b) Write data to the physical device sda c) Create a temporary file /dev/sda and write data to it d) None of the above

23 :: Which variable is used to display number of arguments specified in command line: a) $0 b) $# c) $* d) $?

24 :: Which variable contains last background job process id: a) $* b) $? c) $$ d) $!

25 :: Syntax to suppress the display of command error to monitor? a) command > &2 b) command 2> &1 c) command 2> &2 d) command 2> /dev/null