Tag: operating systems

Questions Related to operating systems

command to kill the last job running at the background.

technology operating systems

  1. kill 1

  2. KILL $$

  3. kill $?

  4. kill $!

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Correct Option: D

What is the keyword "echoe" used for

technology operating systems

  1. Used to display the chanrecters that follow this unix command (Similar to echo).

  2. When combined with "stty" as a switch (stty -echoe) would actually remove the backspaced charecter from display.

  3. There is no such command / option in UNIX

  4. a & b are correct

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Correct Option: B

command to delete all files in the current directory and its sub directories?

technology operating systems

  1. rm -r *

  2. rmdir *

  3. Both the above

  4. None of there

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Correct Option: A

Number of prompts available in Unix system?

technology operating systems

  1. 1

  2. 2

  3. 5

  4. unlimited

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Correct Option: B

What will the following command do? $ echo *

technology operating systems

  1. This will not work

  2. Similar to ls command and displays all files in current dir

  3. will display the string " * "

  4. will display all the files in the previously ccessed directory

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Correct Option: B

nohup command if added in front of any command will continue running the command or process even if you shut down your terminal or close your session to machine

technology operating systems

  1. True

  2. False

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Correct Option: B

UNIX command to wait for a specified number of seconds before exit.

technology operating systems

  1. sleep n

  2. sleep(n-1)

  3. snooze(n)

  4. snooze n

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Correct Option: A

If kill command does not allow killing of a process then we could use kill -9 to forcefully kill the process by mentioning the PID

technology operating systems

  1. True

  2. False

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Correct Option: B

Grep usually takes the input from another command (usually content of file or folders etc) where Find works without taking input from another command
technology operating systems

  1. True

  2. False

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Correct Option: B

The tar command archives and extracts files to and from a single file called a tarfile.
technology operating systems

  1. Yes, Correct

  2. No This is for JAR command

  3. TAR and JAR are same

  4. none of these

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Correct Option: A