The $ variables in a shell script context designates

The exit status of the shell script

Number of command line arguments

PID of the shell running the script

The exit status of the shell script

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

Create a temporary file /dev/sda and write data to it

Write data into a regular file called /dev/sda

Write data to the physical device sda

Create a temporary file /dev/sda and write data to it

file1 content will be appended to file2 and finally stored in file3

file1 content will be appended to file2 and file3 will be ignored

file2 and file3 will have same content

Write standard output and standard error to abc

Write standard output to abc & standard error to monitor

Write standard output and standard error to abc

Write standard output to abc & standard error to monitor

What is a shell in UNIX?

a program through which users can issue commands to UNIX

the thing that rides on the back of a turtle in UNIX

Which is true with regards to the shell prompt

It can be accidentally erased with backspace

The prompt can be customized (modified)

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

The current shell will try to execute it

Interface between Kernel and Hardware

Interface between user and applications

Files that cannot be opened by ordinary user for writing

Those whose ‘read’ bit is set to ‘h’

Permitted for (can be accessed) only superusers

Files that begin with a ‘.’

Files that cannot be opened by ordinary user for writing

While executing a command, the shell

Loads a special program to take care of the execution

Executes it in the same process (as shell)

Creates a child shell to execute it

Loads a special program to take care of the execution

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

The pipe operator provided by the shell can be used

which of these is NOT a valid variable in bash

_var_ (underscore var underscore)

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

cat file1.txt file2.txt > new.txt

ls file1.txt file2.txt | new.txt

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

cat filename | tail -5 | head -10

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

List the number of users logged in

List the number of users in the system

Display the content of who command

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

user can’t change the password

The shell program that authenticates the user while logging in

The shell program that runs when the user logs in

The shell program that authenticates the user while logging in

Common shell for all the users that belong to the same group

The id of a user when the user’s account is deleted

automatically hang up the process after logout

continue the process after logout

manually hang up the process after logout

we can change the priority of a running process using

priority cannot be changed for a running process

only superuser can change the priority

When a child process exits before the parent process exits, which of the following is tru

the child process becomes defunct

the parent process becomes defunct

if the parent process does not handle SIGCHLD, the child process becomes a zombie

746 + Mcqs in Linux in Technical Programming Page 12 McqOptions

551.	Which of the following file set in the current directory are identified by the regular expression a?b*
A.	afcc, aabb
B.	aabb, axbc
C.	abbb, abxy
D.	abcd, axbb
Answer» C. abbb, abxy

Discussion

552.	Specifies
A.	one or more character
B.	zero or more charecter
C.	one character
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

553.	* Specifies
A.	one or more character
B.	zero or more charecter
C.	nothing
D.	none of the mentioned
Answer» C. nothing

Discussion

554.	Which command can be used to test various file attributes
A.	if
B.	file
C.	test
D.	type
Answer» D. type

Discussion

555.	Which variable contains last background job process id
A.	$*
B.	$?
C.	$$
D.	$!
Answer» E.

Discussion

556.	Which variable is used to display number of arguments specified in command line
A.	$0
B.	$#
C.	$*
D.	$?
Answer» C. $*

Discussion

557.	The $ variables in a shell script context designates
A.	The runtime of the script
B.	Number of command line arguments
C.	PID of the shell running the script
D.	The exit status of the shell script
Answer» D. The exit status of the shell script

Discussion

558.	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 mentioned
Answer» C. Create a temporary file /dev/sda and write data to it

Discussion

559.	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
Answer» E.

Discussion

560.	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
Answer» E.

Discussion

561.	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
Answer» C. echo foo \| /tmp/var

Discussion

562.	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
Answer» C. Write standard error to abc

Discussion

563.	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
Answer» E.

Discussion

564.	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
Answer» D. None of the mentioned

Discussion

565.	Which of the following files will not be displayed by the command cat re* ?
A.	reminder
B.	receipt
C.	Receipt
D.	recipe-cake
Answer» D. recipe-cake

Discussion

566.	BASH shell stands for?
A.	Bourne-again Shell
B.	Basic Access Shell
C.	Basic to Advanced Shell
D.	Big & Advanced Shell
Answer» B. Basic Access Shell

Discussion

567.	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
A.	/home/bhojas/project/module1
B.	/home/project/module1
C.	/usr/bhojas/project/module1
D.	project/module1
Answer» B. /home/project/module1

Discussion

568.	Which of the following represents an absolute path?
A.	../home/file.txt
B.	bin/cat
C.	cs2204/
D.	/usr/bin/cat
Answer» E.

Discussion

569.	What is a shell in UNIX?
A.	a program through which users can issue commands to UNIX
B.	a window management system
C.	the login screen
D.	the thing that rides on the back of a turtle in UNIX
Answer» B. a window management system

Discussion

570.	Which is true with regards to the shell prompt
A.	It can be accidentally erased with backspace
B.	The prompt cannot be modified
C.	The prompt can be customized (modified)
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

571.	If a file with execute permissions set, but with unknown file format is executed
A.	The file is passed to /bin/sh
B.	The system returns an error
C.	The current shell will try to execute it
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

572.	Shell is ?
A.	Command Interpreter
B.	Interface between Kernel and Hardware
C.	Interface between user and applications
D.	Command Compiler
Answer» B. Interface between Kernel and Hardware

Discussion

573.	Hidden files are
A.	Those whose ‘read’ bit is set to ‘h’
B.	Permitted for (can be accessed) only superusers
C.	Files that begin with a ‘.’
D.	Files that cannot be opened by ordinary user for writing
Answer» D. Files that cannot be opened by ordinary user for writing

Discussion

574.	For every successful login, which script will be executed?
A.	/etc/inittab
B.	/etc/profile
C.	/etc/login
D.	/etc/init
Answer» C. /etc/login

Discussion

575.	Which command is used to debug a shell script program
A.	set
B.	set -x
C.	debug
D.	db
Answer» C. debug

Discussion

576.	Which variable contains current shell process id
A.	$*
B.	$?
C.	$$
D.	$!
Answer» D. $!

Discussion

577.	While executing a command, the shell
A.	Executes it in the same process (as shell)
B.	Creates a child shell to execute it
C.	Loads a special program to take care of the execution
D.	None of the mentioned
Answer» C. Loads a special program to take care of the execution

Discussion

578.	Which of the following commands allows definition and assignment of environment variables under bash
A.	env
B.	export
C.	environ
D.	setenviron
Answer» B. export

Discussion

579.	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
Answer» D. It can not be done

Discussion

580.	The statement z = ‘expr 5 / 2’ would store which of the following values in z?
A.	0
B.	1
C.	2
D.	2.5
Answer» D. 2.5

Discussion

581.	The expression expr -9 % 2 evaluates to:
A.	0
B.	1
C.	-1
D.	2
Answer» D. 2

Discussion

582.	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)
Answer» E.

Discussion

583.	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
Answer» C. mv file[12].txt new.txt

Discussion

584.	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
Answer» B. cat filename \| head \| tail -5

Discussion

585.	Which of the following files need to be referred for user’s secondary group?
A.	/etc/passwd
B.	/etc/shadow
C.	/etc/group
D.	/etc/profile
Answer» D. /etc/profile

Discussion

586.	By default, a Linux user falls under which group?
A.	staff
B.	others
C.	same as userid (UPG)
D.	system
Answer» D. system

Discussion

587.	What does the following command do ? who \| wc –l
A.	List the number of users logged in
B.	List the users
C.	List the number of users in the system
D.	Display the content of who command
Answer» B. List the users

Discussion

588.	Which of the following command can be used to change the user password?
A.	user can’t change the password
B.	passwd
C.	passd
D.	pwd
Answer» C. passd

Discussion

589.	The login shell is
A.	The shell program that runs when the user logs in
B.	The shell program that authenticates the user while logging in
C.	Common shell for all the users that belong to the same group
D.	None of the mentioned
Answer» B. The shell program that authenticates the user while logging in

Discussion

590.	User id 0 is
A.	An innvalid user id
B.	The id of the root user
C.	The id of a user when the user’s account is deleted
D.	None of the mentioned
Answer» C. The id of a user when the user’s account is deleted

Discussion

591.	The /etc/passwd file doesn’t contain
A.	userid
B.	home directory for a user
C.	login shell name
D.	none of the mentioned
Answer» E.

Discussion

592.	Which of the following identifiers associated with a process decide its privilege level
A.	uid
B.	suid
C.	euid
D.	gid
Answer» D. gid

Discussion

593.	A user can change the default log-in shell using
A.	chmod
B.	chsh
C.	rmsh
D.	tchsh
Answer» C. rmsh

Discussion

594.	The encrypted password of a user is stored in
A.	/etc/shadow
B.	/etc/enpasswwd
C.	/etc/.passwd
D.	/etc/passwd
Answer» B. /etc/enpasswwd

Discussion

595.	User’s Primary Group id is listed in which file, at the time of creation of the user (On a standard Unix system)
A.	/etc/passwd
B.	/etc/groups
C.	/etc/login
D.	/etc/profile
Answer» B. /etc/groups

Discussion

596.	nohup is used to
A.	automatically hang up the process after logout
B.	continue the process after logout
C.	create backgroung process
D.	manually hang up the process after logout
Answer» C. create backgroung process

Discussion

597.	we can change the priority of a running process using
A.	nice
B.	renice
C.	priority cannot be changed for a running process
D.	only superuser can change the priority
Answer» C. priority cannot be changed for a running process

Discussion

598.	The signal sent to a process when the Ctrl-C key is pressed is
A.	KILL
B.	TSTP
C.	TERM
D.	INT
Answer» E.

Discussion

599.	When a child process exits before the parent process exits, which of the following is tru
A.	the child process becomes defunct
B.	the parent process becomes defunct
C.	if the parent process does not handle SIGCHLD, the child process becomes a zombie
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

600.	Which of the following values for STAT column of ps command is not true:
A.	status R means running
B.	Status S means sleeping
C.	Status E means exited
D.	Status Z means zombie
Answer» D. Status Z means zombie

Discussion

Explore topic-wise MCQs in Technical Programming.

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

Specifies

* Specifies

Which command can be used to test various file attributes

Which variable contains last background job process id

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

The $ variables in a shell script context designates

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

cat < file1 >> file2 | file3

Syntax to suppress the display of command error to monitor?

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

cmd > abc 2>&1 will

cmd 2>&1 > abc will

The redirection 2> abc implies

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

BASH shell stands for?

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

Which of the following represents an absolute path?

What is a shell in UNIX?

Which is true with regards to the shell prompt

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

Shell is ?

Hidden files are

For every successful login, which script will be executed?

Which command is used to debug a shell script program

Which variable contains current shell process id

While executing a command, the shell

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

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

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

The expression expr -9 % 2 evaluates to:

which of these is NOT a valid variable in bash

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

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

Which of the following files need to be referred for user’s secondary group?

By default, a Linux user falls under which group?

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

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

The login shell is

User id 0 is

The /etc/passwd file doesn’t contain

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

A user can change the default log-in shell using

The encrypted password of a user is stored in

User’s Primary Group id is listed in which file, at the time of creation of the user (On a standard Unix system)

nohup is used to

we can change the priority of a running process using

The signal sent to a process when the Ctrl-C key is pressed is

When a child process exits before the parent process exits, which of the following is tru

Which of the following values for STAT column of ps command is not true: