R4RIN – MCQs, Mock Tests | Unix/Lunux Linux Mcqs Questions Set 4

Which of the following identifiers associated with a process decide its privilege level

1. uid
2. suid
3. euid
4. gid

✅ Correct Answer: 3

The /etc/passwd file doesn’t contain

1. userid
2. home directory for a user
3. login shell name
4. none of the mentioned

✅ Correct Answer: 2

User id 0 is

1. An innvalid user id
2. The id of the root user
3. The id of a user when the users account is deleted
4. None of the mentioned

✅ Correct Answer: 2

The login shell is

1. The shell program that runs when the user logs in
2. The shell program that authenticates the user while logging in
3. Common shell for all the users that belong to the same group
4. None of the mentioned

✅ Correct Answer: 1

Which of the following command can be used to change the user password?

1. user cant change the password
2. passwd
3. passd
4. pwd

✅ Correct Answer: 2

What does the following command do ? who | wc –l

1. List the number of users logged in
2. List the users
3. List the number of users in the system
4. Display the content of who command

✅ Correct Answer: 1

By default, a Linux user falls under which group?

1. staff
2. others
3. same as userid (UPG)
4. system

✅ Correct Answer: 3

Which of the following files need to be referred for users secondary group?

1. /etc/passwd
2. /etc/shadow
3. /etc/group
4. /etc/profile

✅ Correct Answer: 3

How do you print the lines between 5 and 10, both inclusive

✅ Correct Answer: 1

Create a new file new.txt that is a concatenation of file1.txt and file2.txt

1. cp file.txt file2.txt new.txt
2. cat file1.txt file2.txt > new.txt
3. mv file[12].txt new.txt
4. ls file1.txt file2.txt | new.txt

✅ Correct Answer: 2

which of these is NOT a valid variable in bash

1. __ (double underscore)
2. _1var (underscore 1 var )
3. _var_ (underscore var underscore)
4. some-var (some hyphen var)

✅ Correct Answer: 4

The expression expr -9 % 2 evaluates to:

1. 0
2. 1
3. -1
4. 2

✅ Correct Answer: 3

The statement z = expr 5 / 2 would store which of the following values in z?

1. 0
2. 1
3. 2
4. 2.5

✅ Correct Answer: 3

To feed standard output of one command to standard input of another in a single shell session

1. IO redirection can be used
2. Named pipes can be used
3. The pipe operator provided by the shell can be used
4. It can not be done

✅ Correct Answer: 3

Which of the following commands allows definition and assignment of environment variables under bash

1. env
2. export
3. environ
4. setenviron

✅ Correct Answer: 1

While executing a command, the shell

1. Executes it in the same process (as shell)
2. Creates a child shell to execute it
3. Loads a special program to take care of the execution
4. None of the mentioned

✅ Correct Answer: 2

Which variable contains current shell process id

1. $*
2. $?
3. $$
4. $!

✅ Correct Answer: 3

Which command is used to debug a shell script program

1. set
2. set -x
3. debug
4. db

✅ Correct Answer: 2

For every successful login, which script will be executed?

1. /etc/inittab
2. /etc/profile
3. /etc/login
4. /etc/init

✅ Correct Answer: 2

Hidden files are

1. Those whose ‘read’ bit is set to ‘h’
2. Permitted for (can be accessed) only superusers
3. iles that begin with a ‘.’
4. Files that cannot be opened by ordinary user for writing

✅ Correct Answer: 3

Shell is ?

1. Command Interpreter
2. Interface between Kernel and Hardware
3. Interface between user and applications
4. Command Compiler

✅ Correct Answer: 1

If a file with execute permissions set, but with unknown file format is executed

1. The file is passed to /bin/sh
2. The system returns an error
3. The current shell will try to execute it
4. None of the mentioned

✅ Correct Answer: 3

Which of the following is true?

1. Shell is a process and can be started by superuser only
2. Shell is a built-in Kernel functionality
3. Shell is a wrapper for all the commands and utilities
4. None of the mentioned

✅ Correct Answer: 3

Which is true with regards to the shell prompt

1. It can be accidentally erased with backspace
2. The prompt cannot be modified
3. The prompt can be customized (modified)
4. None of the mentioned

✅ Correct Answer: 3

What is a shell in UNIX?

1. a program through which users can issue commands to UNIX
2. a window management system
3. the login screen
4. the thing that rides on the back of a turtle in UNIX

✅ Correct Answer: 1

Which of the following represents an absolute path?

1. ../home/file.txt
2. bin/cat
3. cs2204/
4. /usr/bin/cat

✅ Correct Answer: 4

BASH shell stands for?

1. Bourne-again Shell
2. Basic Access Shell
3. Basic to Advanced Shell
4. Big & Advanced Shell

✅ Correct Answer: 1

Which of the following files will not be displayed by the command cat re* ?

1. reminder
2. receipt
3. Receipt
4. recipe-cake

✅ Correct Answer: 3

The redirection 2> abc implies

1. Write file 2 to file abc
2. Write standard output to abc
3. Write standard error to abc
4. None of the mentioned

✅ Correct Answer: 3

cmd 2>&1 > abc will

1. Write file2 to file1
2. Write standard output and standard error to abc
3. Write standard error to abc
4. Write standard output to abc & standard error to monitor

✅ Correct Answer: 4

Which of these is the correct method for appending “foo” in /tmp/bar file?

1. echo foo > /tmp/bar
2. echo foo >> /tmp/bar
3. echo foo | /tmp/var
4. /tmp/bar < echo foo

✅ Correct Answer: 2

Syntax to suppress the display of command error to monitor?

1. command > &2
2. command 2> &1
3. command 2> &2
4. command 2> /dev/null

✅ Correct Answer: 4

cat < file1 >> file2 | file3

1. file1 content will be appended to file2 and finally stored in file3
2. file1 content will be appended to file2 and file3 will be ignored
3. file2 and file3 will have same content
4. syntax error

✅ Correct Answer: 4

Executing cat /etc/password > /dev/sda as superuser will

1. Write data into a regular file called /dev/sda
2. Write data to the physical device sda
3. Create a temporary file /dev/sda and write data to it
4. None of the mentioned

✅ Correct Answer: 2

The $ variables in a shell script context designates

1. The runtime of the script
2. Number of command line arguments
3. PID of the shell running the script
4. The exit status of the shell script

✅ Correct Answer: 3

Which variable is used to display number of arguments specified in command line

1. $0
2. $#
3. $*
4. $?

✅ Correct Answer: 2

Which variable contains last background job process id

1. $*
2. $?
3. $$
4. $!

✅ Correct Answer: 4

Which command can be used to test various file attributes

1. if
2. file
3. test
4. type

✅ Correct Answer: 3

* Specifies

1. one or more character
2. zero or more charecter
3. nothing
4. none of the mentioned

✅ Correct Answer: 2

? Specifies

1. one or more character
2. zero or more charecter
3. one character
4. none of the mentioned

✅ Correct Answer: 3

Which of the following file set in the current directory are identified by the regular expression a?b*

1. afcc, aabb
2. aabb, axbc
3. abbb, abxy
4. abcd, axbb

✅ Correct Answer: 2

What command would send the output of cmd1 to the input of cmd2?

1. cmd1 | cmd2
2. cmd1 || cmd2
3. cmd1 && cmd2
4. cmd1 ; cmd2

✅ Correct Answer: 1

What is the output of the following command for bash shell: echo linux $0

1. linux echo
2. linux linux
3. linux bash
4. linux

✅ Correct Answer: 3

Which variable will display the list of the positional parameters?

1. $#
2. $*
3. $?
4. $$

✅ Correct Answer: 2

Which option of grep displays the line number as well?

1. -v
2. -l
3. -n
4. -E

✅ Correct Answer: 3

How can you search for blank line in a file?

1. $ grep “ “ file
2. $ grep “^$” file
3. $ grep [“ “] file
4. $ grep [^$] file

✅ Correct Answer: 2

Assuming the files fileA, fileB, fileAB, fileBC and fileABC, exist in a directory, which files match with the pattern file[ABC]?

1. fileA, fileB and fileABC
2. fileABC
3. fileA and fileB
4. fileAB, fileBC and fileABC

✅ Correct Answer: 3

What will be printed for the command below? $ grep –c “^echo” abc

1. The count of lines that do not contain the pattern echo in file abc
2. The count of lines which begin with the pattern echo in file abc
3. The count of lines that ends with the pattern echo in file abc
4. None of the mentioned

✅ Correct Answer: 2

Which one is used to select only one copy of the repeated lines?

1. uniq -u
2. uniq -d
3. uniq -c
4. uniq –I

✅ Correct Answer: 1

Indicate the right option to search for BOB, Bob, BOb or BoB?

1. grep –i Bob files
2. grep ‘B[oO][bB]’ files
3. grep ‘[BOB]’ files
4. grep -v ‘Bob’ files

✅ Correct Answer: 2