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linux: awk: Learning Linux Commands: awk : Rares Aioanei : 24 2011 : . : 22 2012 .1. , awk - , . . , . Aho,Weinberger Kernighan (, Brian Kernighan), , 1977 . C, awk. Linux , , , , , , . Arnold Robbins awk.

2. awk?awk - / . awk Larry Wall, Perl. awk sed. awk, Perl, . sed, awk , , . awk . Debian , awk , , aptitude. :$ dpkg -l | awk ' {print $2} ' > installed

, rpm's -qa, , . , dpkg -l , , .

3. , , awk, , - : awk 'condition { action }'. , , , , vim, (, grep, , , , ), :$ dpkg -l | awk ' /'vim'/ {print $2} '

, "vim" . , awk - . "vim" "lib", 1300 . , , awk . , , . , awk. , , GNU awk ( , ). - , bash, ksh sh, (t)csh.

4.

awk ' {print $1,$3} '

, stdin

awk ' {print $0} '

, stdin

,

linux: awk 3/21/14

http://rus-linux.net/MyLDP/consol/awk.html 1 / 1

awk ' /'pattern'/ {print $2} ' ,

"pattern",

stdin

awk -f script.awk inputfile

sed, awk -f

, ,

.

awk ' program ' inputfileprogram,

inputfile

awk "BEGIN { print \"Hello, world!!\" }"

"Hello, world" awk

awk '{ print }' ,

, EOF

#! /bin/awk -fBEGIN { print "Hello, world!" }

awk "Hello, world!"(

chmod )

# This is a program that prints \"Hello, world!"# and exits

awk

awk -F "" 'program' files

null,

awk -F "regex" 'program' files

awk '{ if (length($0) > max) max = \length($0) }

END { print max }' inputfile

awk 'length($0) > 80' inputfile

80

awk 'NF > 0' data

,

(NF Number of Fie lds)

awk 'BEGIN { for (i = 1; i

.

awk '$1 ~/J/' inputfile

,

j.

awk '$1 ~!/J/' inputfile

,

j.

awk 'BEGIN { print "He said \"hi!\" \to her." }'

awk.

echo aaaabcd | awk '{ sub(/a+/, \ ""); print }' "bcd"

awk '{ $2 = $2 - 10; print $0 }' inventory

inventory

,

10.

awk '{ $6 = ($5 + $4 + $3 + $2); print \ $6' inventory

inventory,

,

.

echo a b c d | awk '{ OFS = ":"; $2 = ""> print $0; print NF }'

OFS - OutputField Separator(

)

"a::c:d" "4",

,

,

.

echo a b c d | awk '{ OFS = ":"; \$2 = ""; $6 = "new"

> print $0; print NF }'

; ,

$4()

$6() ( $5),

"a::c:d::new""6".

echo a b c d e f | awk '\{ print "NF =", NF;> NF = 3; print $0 }'

()

.

FS=[ ]

.

echo ' a b c d ' | awk 'BEGIN { FS = \"[ \t\n]+" }

> { print $2 }'

"a".

awk -n '/RE/{p;q;}' file.txt

.

awk -F\\\\ '...' inputfiles ...

\\

BEGIN { RS = "" ; FS = "\n" }{

print "Name is:", $1print "Address is:", $2

print "City and State are:", $3

"John Doe1234 Unknown

Ave.Doeville , MA",

linux: awk 3/21/14


print ""}

,

.

awk 'BEGIN { OFS = ";"; ORS = "\n\n" }> { print $1, $2 }' inputfile

,

:

"fie ld1:fie ld2 fie ld3;fie ld4

...;..."

-

,

- ";".

awk 'BEGIN {> OFMT = "%.0f" # print numbers as \

integers (rounds)> print 17.23, 17.54 }'

17

18 ,

(OutputForMaT)

.awk 'BEGIN {

> msg = "Dont Panic!"> printf "%s\n", msg

>} '

printf , C.

awk '{ printf "%-10s %s\n", $1, \$2 }' inputfile

10,

,

.

awk '{ print $2 > "phone-list" }' \inputfile

,

"phone-

list".

awk '{ print $1 > "names.unsorted" command = "sort -r > names.sorted" print $1 | command }' inputfile

,

$1, ,

.

awk 'BEGIN { printf "%d, %d, %d\n", 011, 11, \0x11 }'

Will print 9, 11, 17if (/foo/ || /bar/) print "Found!"

foo bar.

awk '{ sum = $2 + $3 + $4 ; avg = sum / 3> print $1, avg }' grades

( C)

awk '{ print "The square root of", \$1, "is", sqrt($1) }'

2The square root of 2 is 1.41421

7The square root of 7 is 2.64575

awk '$1 == "start", $1 == "stop"' inputfile

start stop.

awk '> BEGIN { print "Analysis of \"foo\"" }

> /foo/ { ++n }> END { print "\"foo\" appears", n,\

"times." }' inputfile

BEGIN END ,

.echo -n "Enter search pattern: "

read patternawk "/$pattern/ "'{ nmatches++ }

END { print nmatches, "found" }' inputfileSearch using shellif (x % 2 == 0)print "x is even"

.awk, C,

?:.

linux: awk 3/21/14


elseprint "x is odd"awk '{ i = 1

while (i

awk

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