Category: Basic of linux unix

A. !
B. $
C. #
D. @

A. to exit status of ast command executed.
B. to process number of the current shell
C. to list the positional parameters
D. to name the command being executed

A. :q
B. :w
C. q!
D. 😡

A. data link layer
B. transport layer
C. network layer
D. session layer

A. httpd
B. shttp
C. dns
D. named

A. x
B. q!
C. :w
D. :q

A. to move cursor left by one position
B. to move cursor right by one position
C. to move cursor down by one line
D. to move cursor to the beginning of the line specified by the number