A. cat
B. grep
C. wc
D. None of the above

A. dir
B. prompt $p$g
C. pwd
D. path

A. to move the cursor to a matching delimiter, when a delimiters a parenthesis, a bracket, or a brace.
B. to move the cursor to the upperleft corner of the screen
C. to move the cursor backward to the beginning of a word
D. to move the cursor to the first column in the current line

A. -4
B. -f
C. -1
D. -2

A. $
B. #
C. :
D. ;

A. ls -l -d
B. ls -l
C. ls -x
D. ls -F

A. sort
B. sh
C. st
D. sort -r

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

A. Bob Young
B. Mark Eving
C. Richard Stallman
D. Linus Torvalds

A. ls | ws – c
B. ls | wc – w
C. ls | wc – l
D. ls | wc