Basic of linux unix

A. x
B. X
C. dd
D. D

A. 1024 bytes
B. 2048 bytes
C. 512 bytes
D. 256 bytes

A. erase
B. delete
C. rm
D. dm

A. chmod go+r note
B. chmod a-rw
C. chmod ugo=r note
D. chmod u+r,g+r,o-x note

A. mesg
B. grep
C. halt
D. sleep

A. rename
B. remove
C. mv
D. ren

A. group has read permission only
B. other has read permission only
C. owner has read permission only
D. group has write permission only

A. ls -1
B. ls -t
C. ls -i
D. ls -R

A. $!
B. $#
C. 0
D. $*

A. remove
B. rm
C. mv
D. del