Unix - Study Mode

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[#501] . . . . . . . . operator is used for selecting current line number.

(A) $0

(B) $1

(C) $.

(D) $_

Correct Answer

(C) $.

[#502] Which option is used by tar to append files to the end of an archive?

(A) -t

(B) -c

(C) -x

(D) -r

Correct Answer

(D) -r

[#503] Which of the following commands are used for the maintenance of user accounts?

(A) useradd

(B) usermod

(C) userdel

(D) useradd, usermod, userdel

Correct Answer

(D) useradd, usermod, userdel

[#504] . . . . . . . . system call is used for writing to a file.

(A) read

(B) write

(C) close

(D) seek

Correct Answer

(B) write

[#505] To know the PID of your current shell, which command will be used?

(A) echo $$

(B) echo $

(C) $SHELL

(D) $PATH

Correct Answer

(A) echo $$