Tag: operating systems

Questions Related to operating systems

How to display only hidden files in UNIX?
technology operating systems

  1. ls -a

  2. ls -a|grep "^."

  3. ls -a|grep "^."

  4. ls -ltra

Show answer
Correct Option: C

Which of the following commands is not a filter?
technology operating systems

  1. man

  2. cat

  3. head

  4. pg

Show answer
Correct Option: A

Command to kill the last background job?

technology operating systems

  1. kill $!

  2. kill -9

  3. kill bg

  4. kill $*

Show answer
Correct Option: A

Which command is used to create a new file system in unix?
technology operating systems

  1. mkfs

  2. create fs

  3. format fs

  4. Not possible

Show answer
Correct Option: A

Which of the following is not a shell variable?
technology operating systems

  1. MAIL

  2. PATH

  3. TERM

  4. MESG

Show answer
Correct Option: D

Which command kills all processes in your system except the login shell?
technology operating systems

  1. kill 0

  2. kill -9

  3. kill 1

  4. kill $$

Show answer
Correct Option: A

How many prompts are available in a UNIX system?

technology operating systems

  1. 0

  2. 1

  3. 2

  4. 3

Show answer
Correct Option: C

How do you find out the number of arguments passed to the shell script?

technology operating systems

  1. $*

  2. $@

  3. $#

  4. $?

Show answer
Correct Option: C

How do you find out the current directory you’re in?

technology operating systems

  1. $dir

  2. pwd

  3. currdir

  4. none

Show answer
Correct Option: B

What are the default umask values
technology operating systems

  1. 000

  2. 022

  3. 033

  4. 222

Show answer
Correct Option: B