Unix - Computer Science Multiple Choice Questions and Answers

(31) A file is removed from the disk if

[A] owner of the file deletes it

[B] count in the open file description table becomes zero

[C] reference count in its inode becomes zero

[D] none of the above

Answer: Option [C]

(32) Several UNIX commands can be combined to generate a single command using:

[A] ;

[B] |

[C] :

[D] none of these

Answer: Option [B]

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(33) How do you change a foreground process into a background process ?

[A] The simplest way to start a background process is to add an ampersand (&) at the end of the command

[B] The simplest way to start a background process is to add an nice command at the beginning of the foreground process command

[C] The simplest way to start a background process is to add an ampersand (&) at the beginning of the foreground process command

[D] The simplest way to start a background process is to add fg command at the beginning of the foreground process command

Answer: Option [A]

(34) Which of the following commands is used to show hidden files ?

[A] df

[B] ls-i

[C] ls-h

[D] ls-a

Answer: Option [D]

(35) Which of the following commands can be used to change any of the system at run-level ?

[A] Power off

[B] init

[C] Halt

[D] Reboot

Answer: Option [B]

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