Which of the following is not a communication command ?
Which of the following is not a communication command ?
		A. grep
B. mail
C. mesg
D. write
		A. grep
B. mail
C. mesg
D. write
		A. A
B. a
C. i
D. I
		A. kill
B. cancel
C. haltsys
D. shutdown
		A. lyrix
B. ed
C. vi
D. cat
		A. sort
B. sh
C. st
D. sort -r
		A. mkboot disk
B. bootfp disk
C. ww and rawwrite
D. dd and rawrite
		A. /dev
B. /bin
C. /etc
D. /home