Shell Scripting/Shell Scripting Mcq Question Set 2 Sample Test,Sample questions

 A variable can be removed using _____

 C shell uses which command for assigning values to variables?

 readonly command is used to protect a variable from reassignment.

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

 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

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

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

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

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

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

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

Command substitution is enabled in single quotes also.

Command substitution requires the command to use _____

Environment variable names can be defined only in uppercase.

Environment variables control the behavior of the system.

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

Functions improves the shell’s programmability significantly, because

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

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

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

Shell variables are of ____ types.

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

The shell has ____ prompts.

The UNIX shell is both _______ and _______ language.

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

We can also execute previous commands by context.

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

We can use relative addressing while executing previous commands.

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

What is the output of this program?

   #!/bin/bash
   for i in 2 3 7
   do
   echo "Sanfoundry"
   done
   exit 0

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

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

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

What will the result when we evaluate this statement?

$ directory=’pwd’=`pwd`

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

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

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

Which environment variable is used to display our username?

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

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

Which of the following is an invalid variable?

Which of the following is not a system defined variable?

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

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

Which of the following shells support the use of aliases?

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

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

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

Which one of the following is not an environment variable?

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

Which symbol is used for assigning a value to variables?

Which symbol is used for evaluation of variables?

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

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

____ command is used to display the environment variables only.