Olete.in – MCQs, Mock Tests & Government Job Prep | Shell Scripting Shell Scripting Mcq Question Set 2

The UNIX shell is both _______ and _______ language.

1. interactive, responsive
2. interpreter, executing
3. scripting, interpreter
4. high level, low level

✅ Correct Answer: 3

Which of the following function(s) are performed by an interactive shell?

1. job control
2. history
3. aliases
4. job control, history, aliases

✅ Correct Answer: 4

Every feature used in an interactive shell can also be used by a shell script.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which one of the following is arguably the best shell to use?

1. Bash
2. Korn
3. C
4. Bourne

✅ Correct Answer: 1

Which one of the following command is used to create a child shell?

1. fork
2. wait
3. sh
4. env

✅ Correct Answer: 3

Shell variables are of ____ types.

1. 1
2. 3
3. 2
4. 4

✅ Correct Answer: 3

Suppose ABD_DIR is a local variable. Then it will be accessible to the child process.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

____ command is used to display the environment variables only.

1. set
2. env
3. sh
4. var divs = #("div");

✅ Correct Answer: 2

____ command displays all the variables available in the current shell.

1. env
2. set
3. var
4. shift

✅ Correct Answer: 2

Environment variable names can be defined only in uppercase.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Environment variables control the behavior of the system.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

The shell has ____ prompts.

1. 1
2. 4
3. many
4. 2

✅ Correct Answer: 4

Which one of the following command will change our primary prompt from $ to C>?

1. PS1=”C> “
2. PS2=”C>”
3. PS1=”>C”
4. PS2=”<C”

✅ Correct Answer: 1

Which environment variable is used to display our username?

1. PATH
2. MAIL
3. LOGNAME
4. HOME

✅ Correct Answer: 3

Which one of the following is not an environment variable?

1. HOME
2. PATH
3. USER
4. env

✅ Correct Answer: 4

Which symbol is used for setting the PS1 prompt to show the current event number?

1. ^
2. !
3. &
4. |

✅ Correct Answer: 2

Which escape sequence is used with PS1 to show the hostname of our computer?

1.
2. c
3. h
4. e

✅ Correct Answer: 3

Which of the following shells support the use of aliases?

1. bourne
2. Korn
3. bash
4. Korn and bash

✅ Correct Answer: 4

We can display an alias definition by using an alias with the name.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which command is used in bash and Korn shells to display the previously used commands?

1. his
2. history
3. sh
4. ps

✅ Correct Answer: 2

To display the last five used commands, which one of the following commands is used (in bash shell)?

1. history 5
2. history -5
3. history
4. history 5-

✅ Correct Answer: 1

Which of the following symbols are used for accessing previous commands by event numbers?

1. !
2. r
3. $
4. ! and r

✅ Correct Answer: 4

We can use relative addressing while executing previous commands.

1. True b) False
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

We can also execute previous commands by context.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which symbol is used as a shorthand for using the last argument to the previous command?

1. %
2. _
3. |
4. $

✅ Correct Answer: 4

Shell enables one or more arguments to be obtained from the standard output of another command. This feature is called _____

1. command substitution
2. argument substitution
3. shell substitution
4. korn

✅ Correct Answer: 1

Which of the following meta-character is used in command substitution?

1. `
2. `
3. “
4. >

✅ Correct Answer: 1

Command substitution is enabled in single quotes also.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

POSIX recommends the use of ____ instead of archaic `command ` for command substitution.

1. |
2. #
3. %
4. $

✅ Correct Answer: 4

Which of the following shell doesn’t support the command substitution using $ recommended by POSIX?

1. Korn
2. bash
3. C
4. Bourne

✅ Correct Answer: 4

Which symbol is used for assigning a value to variables?

1. $
2. &
3. =
4. @

✅ Correct Answer: 3

Which symbol is used for evaluation of variables?

1. $
2. &
3. =
4. @

✅ Correct Answer: 1

Which of the following is a correct initialization of variables to null strings?

1. x=
2. x=’ ‘
3. x=” “
4. x=, x=’ ‘, x=” “

✅ Correct Answer: 4

A variable can be removed using _____

1. unset
2. readonly
3. del
4. Bash shell

✅ Correct Answer: 1

readonly command is used to protect a variable from reassignment.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

C shell uses which command for assigning values to variables?

1. =
2. set
3. unset
4. $

✅ Correct Answer: 2

The variable assignment as x = 10 (whitespace on both sides of =) will work if we are not using C shell?

1. True
2. FALSE
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

What will the result when we evaluate this statement? $ directory=’pwd’=`pwd`

1. output of pwd command along with string pwd=
2. undefined output
3. erroneous
4. directory variable will hold string pwd

✅ Correct Answer: 1

Which of the following is not a system defined variable?

1. $PATH
2. $HOME
3. $SHELL
4. $cd

✅ Correct Answer: 4

Which of the following is an invalid variable?

1. _user
2. us01
3. -txtfile
4. txt123

✅ Correct Answer: 3

Command substitution requires the command to use _____

1. standard input
2. standard input
3. standard error
4. All of the mentioned

✅ Correct Answer: 2

The command is valid. $ ls -lRa $HOME > home.ls

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which command runs the shell built-in command ‘command’ with the given argument?

1. builtin
2. caller
3. there is no command present for this purpose
4. none of the mentioned

✅ Correct Answer: 1

Which option of the command ‘cd’ use the actual filesystem path for cd.. and the value of pwd?

1. -l
2. -L
3. -p
4. -P

✅ Correct Answer: 4

Which command generates possible completions for string according to the and write it to standard output?

1. compgen
2. complete
3. continue
4. none of the mentioned

✅ Correct Answer: 1

After running this program, as your press 4, what will be the output of the program? #!/bin/bash echo "How many times you want to print 'Sanfoundry'" read value for ((i=0;i<$value;i++)) do echo "Sanfoundry"; done exit 0

1. ‘Sanfoudry’ will print 4 times
2. ‘Sanfoudry’ will print 3 times
3. ‘Sanfoudry’ will print 5 times
4. Program will generate an error message

✅ Correct Answer: 1

What is the output of this program? #!/bin/bash for i in 2 3 7 do echo "Sanfoundry" done exit 0

1. ‘Sanfoundry’ will print 3 times
2. Nothing will print
3. Program will generate an error message
4. none of the mentioned

✅ Correct Answer: 1

How can you come out of the loop in this program? #!/bin/bash read x while [ $x != "hello" ] do echo "Try to come out of the loop" read x done echo "Welcome" exit 0

1. by entering “hello”
2. by entering anything except “hello”
3. it is not possible
4. None of the mentioned

✅ Correct Answer: 1

What is the output of this program? #!/bin/bash echo "Which file do you want to check" read x until [ -e $x ] do echo "The file does not exist. Do you want to create? y/n" read a if [ $a = y ]; then touch $x echo "Your file has been created successfully." fi done echo "The file is present in this directory" exit 0

1. it checks the existance of your entered file in the present working directory
2. it creates the file if file does not exists
3. program runs untill you create the file
4. All of the Mentioned

✅ Correct Answer: 4

After running this program, if you enter 1000, then what will be the output of the program? #!/bin/bash echo "Please enter a number" read a if [ $a -lt 100 ]; then echo "It is less than 100"; elif [ $a -lt 1000 ]; then echo "It is less than 1000" else echo "It is greater than 1000" fi exit 0

1. It is greater than 1000
2. It is less then 1000
3. It is equal to 1000
4. None of then mentioned

✅ Correct Answer: 1

Functions improves the shell’s programmability significantly, because

1. when we invoke a function, it is already in the shell’s memory, therefore a function runs faster than seperate scripts
2. function will not provides a piece of code for repetative tasks
3. all of the mentioned
4. None of the mentioned

✅ Correct Answer: 1

What is the output of this program? #!/bin/sh san_function() { echo "Welcome to the Sanfoundry" printf "World of Linux " } unset -f san_function san_function exit 0

1. Welcome to the Sanfoundry
2. World of Linux
3. both Welcome to the Sanfoundry and World of Linux
4. nothing will print

✅ Correct Answer: 4

What is the output of this program? #!/bin/sh echo "Just call the function" san_function san_function() { echo "This is a function" } exit 0

1. only first string will print without any error
2. only second string will print without any error
3. both strings will print
4. None of the mentioned

✅ Correct Answer: 4

What is the output of this program? #!/bin/sh san_function1() { a=5 echo "This is the first function" san_function2 } san_function2() { echo "This is the second function" san_function3 } san_function3() { echo "This is the third function" } san_function1 exit 0

1. This is the first function This is the second function This is the third function
2. This is the first function This is the third function This is the second function
3. This is the second function This is the first function This is the third function
4. This is the third function This is the first function This is the second function

✅ Correct Answer: 1

The user bhojas logged in and performed the following sequence of command. What will be the output of the last command? $ cd project/module1 $ pwd

1. /home/bhojas/project/module1
2. /home/project/module1
3. /usr/bhojas/project/module1
4. project/module1

✅ Correct Answer: 1