R4RIN – MCQs, Mock Tests | Unix/Lunux Linux Mcqs Questions Set 5

How do you remove duplicate lines from the file foo using uniq?

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

✅ Correct Answer: 1

What is the command that can print lines of first file matching with second file?

1. printline
2. cmp
3. com
4. comm

✅ Correct Answer: 4

Which character to use to escape meaning of special characters in search operations?

1. [].
2. ^
3. .'
4.

✅ Correct Answer: 4

When the return value of any function is not specified within the function, what function returns?

1. nothing
2. exit status of the last command executed
3. 0
4. none of the mentioned

✅ Correct Answer: 2

Parameters can be passed to a function

1. by using the parameter variables $1, $2, $3…….
2. by using the environment variables
3. by using the parameter & environment variables
4. none of the mentioned

✅ Correct Answer: 1

Which of the following command provides the list of the functions defined in the login session?

1. declare -f
2. declare -F
3. both declare -f and -F
4. none of the mentioned

✅ Correct Answer: 3

The keyword local is used

1. to define a variable within a function for its local scope
2. to redefine any global variable
3. this is not a valid keyword
4. none of the mentioned

✅ Correct Answer: 1

Functions improves the shells programmability significantly, because

1. when we invoke a function, it is already in the shells 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

In the shell, by default, all variables are considered and stored as

1. string
2. integer
3. character
4. float

✅ Correct Answer: 1

Which command reads user input from the terminal and assign this value to a variable name?

1. read
2. get
3. declare
4. set

✅ Correct Answer: 1

Which one of the following statement is true about variables in shell?

1. variables do not require declaration before assigning value to them
2. variables are case sensitive
3. to extract the contents of a variable, we have to provide the variable a preceding $
4. all of the mentioned

✅ Correct Answer: 4

Which one of the following is not a valid shell variable?

1. _san
2. san_2
3. _san_2
4. 2_san

✅ Correct Answer: 4

To redefine a variable, it can be removed from the list of variables by using the command

1. unset
2. delete
3. remove
4. clear

✅ Correct Answer: 1

Which built-in command performs integer arithmetic in bash shell?

1. let
2. get
3. set
4. none of the mentioned

✅ Correct Answer: 1

Which expression use the value of the enclosed arithmetic expression?

1. $(())
2. $()
3. ${}
4. $[].

✅ Correct Answer: 1

If a and b are 2 variables then the meaning of a<<=b is

1. b = a << b
2. a = a << b
3. b = b << a
4. a = a << b

✅ Correct Answer: 2

Which one of the following is bitwise exclusive or operator?

1. ^=
2. |=
3. !=
4. none of the mentioned

✅ Correct Answer: 1

Which one of the following is not a valid operator in bash shell?

1. ||
2. ~
3. =<<
4. -=

✅ Correct Answer: 3

This set of Linux / Unix questions and answers focuses on Command History and Job Control in Bash Shell programming fc stands for

1. find command
2. fix command
3. both find & fix command
4. none of the mentioned

✅ Correct Answer: 3

Which command is used to reexecute the previous command?

1. !!
2. !cat
3. !3
4. !$

✅ Correct Answer: 1

Which one of the following is not correct about job control in bash shell?

1. it is the ability to stop and resume any process running in shell at a later point
2. user employs this facility via an interactive interface supplied by the kernels terminal driver and bash
3. it is the ability to create any process
4. none of the mentioned

✅ Correct Answer: 3

Which command allows to view the current jobs being handled by the shell?

1. jobs
2. view
3. show
4. none of the mentioned

✅ Correct Answer: 1

What is job number?

1. same as PID
2. a unique number, assigned to each job in shell
3. same as PID and a unique number, assigned to each job in shell
4. none of the mentioned

✅ Correct Answer: 2

Ctrl-Z key combination

1. generates a SIGINT signal
2. stops the process running in the shell
3. kills the process running in the shell
4. generates a SIGINT signal & kills the process running in the shell

✅ Correct Answer: 2

Which command brings a background job into the foreground?

1. fg
2. bg
3. jobs %1
4. none of the mentioned

✅ Correct Answer: 1

kill %s command will

1. terminate the job whose command line starts with s
2. terminate the last job
3. terminate the first job
4. none of the mentioned

✅ Correct Answer: 1

stty tostop command will

1. stop all jobs running in the shell
2. stop background jobs if they try to send output to the terminal
3. this is not a valid command
4. none of the mentioned

✅ Correct Answer: 2

Which command terminates a running process by name of the process?

1. kill
2. pkill
3. killall
4. none of the mentioned

✅ Correct Answer: 3

Which command sets up shorthand for command or command line?

1. set
2. alias
3. new
4. echo

✅ Correct Answer: 2

What is the function of bind command in bash shell?

1. defining new macros
2. defining new key bindings for existing commands
3. dumping the installed key bindings
4. all of the mentioned

✅ Correct Answer: 4

The command ‘compgen -c’ shows

1. all variable names
2. all system wide aliases
3. full list of all commands
4. none of the mentioned

✅ Correct Answer: 3

Which statement resumes the next iteration of a for, while, select, or untill loop?

1. continue
2. break
3. complete
4. command

✅ Correct Answer: 1

Which command prints the directory stack?

1. cd
2. dirs
3. popd
4. pushd

✅ Correct Answer: 2

The command ‘disown -r’

1. removes all jobs
2. removes all running jobs
3. marks jobs to not receive SIGHUP when bash exits
4. marks all jobs

✅ Correct Answer: 2

The command ‘enable -n ‘

1. enables the specified built-in command
2. disables the specified built-in command
3. print the status of the command
4. none of the mentioned

✅ Correct Answer: 2

Which command can create environment variable?

1. export
2. set
3. read
4. none of the mentioned

✅ Correct Answer: 1

Which command concatenate the specified argument into a single command, then execute the command?

1. fc
2. eval
3. exec
4. getopts

✅ Correct Answer: 2

The command hash

1. manages a internal hash table
2. find and remember the full path name of the specified command
3. displays used command names and the number of hits
4. all of the mentioned

✅ Correct Answer: 4

The ‘logout’ built in command is used to

1. shutdown the computer
2. logoff of the computer
3. logout the current user
4. to exit the current shell

✅ Correct Answer: 4

The command umask -S

1. prints the current mask using symbolic notation
2. prints the current mask using octal numbers
3. sets the mask to 000
4. sets the mask to 777

✅ Correct Answer: 1

The mapfile command

1. reads lines of standard input and assigns each to the element of an indexed array
2. reads lines of standard output file
3. reads lines of standard error file
4. none of the mentioned

✅ Correct Answer: 1

Which option of the kill command sends the given signal name to the specified process?

1. -l
2. -n
3. -s
4. -a

✅ Correct Answer: 3

Which command removes a directory from directory stack?

1. dirs
2. popd
3. pushd
4. rm

✅ Correct Answer: 2

Which command puts a script to sleep untill a signal is recieved?

1. sleep
2. suspend
3. disown
4. break

✅ Correct Answer: 2

The command ulimit

1. set a limit on specified resource for system users
2. set/show process resource limit
3. set a limit on specified resource for system users & set/show process resource limit
4. none of the mentioned

✅ Correct Answer: 3

Which command identifies the resource of a command?

1. type
2. typeset
3. select
4. source

✅ Correct Answer: 1

Which command wait for the specified process to complete and return the exit status?

1. sleep
2. wait
3. delay
4. stop

✅ Correct Answer: 2

Which command prints the accumulated user and system times for processes run from the shell?

1. time
2. times
3. both time and times
4. none of the mentioned

✅ Correct Answer: 2

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