21. What command is used to display the characteristics of a process?
A. au
B. ps
C. du
D. pid
E. None of the above
22. What command is not used to list the files chap01, chap02 and chap04?
A. ls chap*
B. ls chap[124]
C. ls – x chap0[124]
D. ls chap0[124]
E. None of the above
23. What command is used with vi editor to replace text from cursor to right
A. S
B. s
C. R
D. r
E. None of the above
24. What sign is used to back up over typing errors in vi?
A. !
B. $
C. #
D. @
E. None of the above
25. What sign is used to erase or kill an entire line you have typed and start you are on a new line (but not display a new prompt)?
A. !
B. $
C. #
D. @
E. None of the above
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