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1 9 AWK a w k a w k s h e l l a w k Bailing out a w k : c m d. L i n e : a w k s h e l l a w k a w k a w g r e p s e d s h e l l a w k a w k a w k a w k a w k a w k a w k s e d g r e p a w k a w k A h o. We n i n b e rg e r K e r n i g h a m n a w k g a w k a w k a w a w k 9.1 awk a w k c o m m a n d s a w k [- F ] a w k p a s s w d - F a w k a w k a w a w k

2 9 AWK 67 - f a w k _ s c r i p t _ f i l e a w k i n p u t _ f i l e ( s ) a w k 9.2 awk a w k a w k - F a w k - F a w k a w k 9-1 a w k # n a w k 9-1 awk P. B u n n y ( 1 ) # 02 / 99 # 48 # Yellow \n J. Tr o l l ( 2 ) # 07 / 99 # 4842 # Brown-3 \n a w k a w k B E G I N E N D B E G I N B E G I N E N D a w k a w k {} i f l o o p i n g a w k a w k $ 1 $ 2... $ n $ 1, $ $ 1, $ 2, $ 3, $ 4, $ 5 $ 0 Aw k $ s h e l l $ p r i n t a w k

3 68 1. g r a d e. t x t F 2. a w k s h e l l a w k > w o w t e e d e l e t e _ m e _ a n d _ d i e a w k tee delete_me_and_die 3. a w k a w k 4. a w k {print $0}( )

4 9 AWK f i e l d - 1 f i e l d - 4 $ 1 $ 4 6. t a b t a b t a b \ t n a m e b e l t \ n \ n B E G I N a w k 7. end of report E N D E N D E N D 8. awk a w k a w a w k

5 70 a w k a w k a w k a w k 9. awk g r a d e. t x t B E G I N a w k s h e l l a w k a w <Ct r l - D > a w k awk g r e p a w k G r e e n / G r e e n / G r e e n a w k 7 \ ^ $. [] () * +? 7 a w k g r e p s e d + + /X Y?Z/ X Y Z Y Z a w k

6 9 AWK awk 1. < > = < = ~ = =! ~!= i f a w k i f g r a d e. t x t b r o w n f i e l d - 4 {if($4~/brown/) print } f i e l d - 4 b r o w n {} a w k i f b r o w n f i e l d a w k = = $ 3 = = ~! ~ b r o w n $0!~/brown/ b r o w n a w k

7 72 f i e l d - 4 awk$4!="brown"{print $0} grade.txt b r o w n b r o w n b r o w n - 2 b r o w n - 3 b r o w n f i e l d - 6 f i e l d [] [ g r e e n /[ G g ] r e e n / 8. a. / ^... a / a 9. y e l l o w b r o w n

8 9 AWK 73 Ye l l o w B r o w n G r e e n g r e e n [] ^ a w k 7 7 a w k && AND : O R! 11. AND P. B u n n y Ye l l o w ( $ 1 = = " P. B u n n y "&& $ 4 = = " Ye l l o w ") && 12. Or Ye l l o w B r o w n awk a w k awk A R G C A R G V E N V I R O N FILENAME F N R F S a w k - F

9 74 N F N R O F S O R S R S A R G C a w k A R G V A R G C A R G V [ n ] n E N V I R O N E N V I R O N [ E D I TO R ] = Vi F I L E N A M E a w k a w k F N R a w k N R F S a w k - F F S = " " N F O F S # O F S = "#" O R S \ n R S (\ n ) NF NR FILENAME a w k N R N R print NR E N D N F E N D B r o w n A N D B r o w n

10 9 AWK 75 / N F $ P W D a w k awk a w k = += *= / = %= ^ = &&! ~! ~ < <= ==!= >> + - * / % ^ a w k n a m e = $ n n a m e n n a m e b e l t n a m e = $ 1 ; b e l t s = $ 4 a w k n a m e b e l t s Ye l l o w 2. 1) B E G I N 2) B E G I N a w k

11 76 B A S E L I N E B E G I N 3. a w k a w k a w k N R N F $ 1 = $ M. Ta n s l e y $ 6 = $ J. Tr o l l J. L. Tr o l l $ 1 = " J. L. Tr o l l " " a w k { $ 4 = $ 2 + $ 3 } g r a d e. t x t 8 { $ 8 = $ 7 - $ 6 } B E G I N t a b

12 9 AWK = $ 1 t o t a l t o t a l + = $ 1 a w k t o t + = $ 6 t o t a w k 6 E N D 6 a w k 8. ls -l a w k a w k d E N D ls -l d 5 9 d ^ [ ^ d ] t o t

13 a w k awk g s u b ( r, s ) g s u b ( r, s, t ) i n d e x ( s, t ) l e n g t h ( s ) m a t c h ( s, r ) s p l i t ( s, a, f s ) s p r i n t ( f m t, e x p ) s u b ( r, s ) s u b s t r ( s, p ) s u b s t r ( s, p, n ) $ 0 s r t s r s t s s r f s s a f m t e x p $ 0 s s p s p n g s u b s e d $ 0 g s u b $ 0 i n d e x s t s t l e n g t h s m a t c h s r s p l i t f s s a s p r i n t p r i n t f f m t e x p s u b r s $ 0 r s u b s p s p s u b s t r s p n a w k 1. gsub / / / index s t B u n n y n y 3. length J. Tr o l l

14 9 AWK match m a t c h 0 A N C D d 0 A N C D D A N C D D J. L u l u 5. split s p l i t - A D2 - K P 9 - J U 2 - L P - 1 s p l i t (" A D 2 - K P 9 - J U 2 - L P - 1 " p a r t s _ a r r a y " -"s p l i t 4 s p l i t m y a r r a y m y a r r a y 6. sub s u b S T R poped popo pill s u b s u b / o p / " o p " S T R o p po Ped pope pill J. Tr o l l s u b / 26 / " 29 " $ 0 24 J. Tr o l l 7. substr s u b s t r 1 5

15 80 a w k L Ta n s l - e y a w k s u b s t r 1 B E G I N E N D t 8. s h e l l a w k a w k a w k a w k s t a n d - b y a w k a w k a w k \ n \ n {} /\{/ a w k 9-5 a w k 9-5 awk \ b \ t t a b \ f \ d d d \ n \ c \\ \ r

16 9 AWK 81 May Day t a b May Day D a y \ 104 D A S C I I \ 141 a A S C I I awk printf t a b a w k p r i n t f p r i n t f % p r i n t f p r i n t f [ ] printf 9-6 awk printf - Wi d t h 0 0. p r e c awk printf % c A S C I I % d % e % f % g a w k e f % o % s % x A S C I I a w k p r i n t f A S C I I p r i n t f a w k

17 82 15 \ n p r i n t p r i n t f 3. a w k a w k a w k a w k a w k awk = a w k A G E 10 a w k 10 a w k df -k a w k 4 $ 4 ~ / ^ [ 0-9 ]/ d f i f ( $ 4 < T R I G G E R ) T R I G G E R df -k d f a w k w h o w h o a w k L O G N A M E w h o a w k

18 9 AWK 83 r o o t root you are connected to ttyp1 4. awk a w k a w k a w k awk t o t + = $ 6 END{print "club student total points " t o t } g r a d e. t x t s t u d e n t _ t o t. a w k a w k a w k a w k /bin/awk -f a w k

19 84 E R R O R * a w k a w k a w k a w k 5. a w k F S F S # F S

20 9 AWK 85 a w k F S B E G I N a w k F S / e t c / p a s s w d 1 5 p a s s w d a w k a w k a w k awk script_file var=value input_file N F M A X / e t c / p a s s w d p a s s w d 7 a w k

21 86 a w k d u d u a w k awk s p l i t s p l i t m y a r r a y m y a r r a y For (element in array ) print array[element] 123 # 456 # 678 s p l i t / d e v / n u l l

22 9 AWK 87 s p l i t # 1) Ye l l o w O r a n g e R e d 2 ) 20 6 a w k a w k

23 88 B E G I N F S # Ye l l o w O r a n g e R e d B E G I N B E G I N c o l o r 1 Ye l l o w O r a n g e R e d S e n i o r _ o r _ j u n i o r 2 j u n i o r s e n i o r E N D \ a w k 9.3 a w k a w k a w k a w k s h e l l s h e l l a w k

ebook 99-1

ebook 99-1 s h e l l 1 setuid chown c h g r p umask ( ) 1) 2) 3) s h e l l 1) 2) 3) 1.1 i ls -l 2 shell total 4232 - r w x r- x r- x 9 9 r w x r- x r- x r w x 1 root root r o o t ( r o o t ) 3578 K Oct 14 04:44 dmesg