AIX下AWK语言的操作符

文章由LinuxBoy分享于2019-03-24 12:03:19热评（75）

AIX下AWK语言的操作符

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awk操作符

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= += *= / = %= ^ = 赋值操作符

? 条件表达操作符

|| && ! 并，与，非

< <= == != >> 关系操作符

+ - * / % ^ 算术操作符

+ + -- 前缀和后缀

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1.设置输入域到域变量名

awk '{name=$1;color=$4; if(color ~/Yello/)print name" " is color "color}' grade.txt

P.Bunny is color Yello

2.赋值比较，通常在BEGIN部分赋值

a.在BEGIN中给变量名赋值

awk 'BEGIN {BASELINE="27 "} {if($6<BASELINE) print $0}' grade.txt

J.Lulu 06/99 48317 green 9 24 26

J.Troll 07/99 4842 Brown-3 12 26 26

b.在关系操作中使用实际数值

awk '{if($6 < 27) print $0}' grade.txt

J.Lulu 06/99 48317 green 9 24 26

J.Troll 07/99 4842 Brown-3 12 26 26

3.修改数值域取值

awk '{if($1=="M.Tansley") $5=$6-1; print $1, $6, $5, $7}' grade.txt

M.Tansley 40 39 44

J.Lulu 24 9 26

P.Bunny 35 12 28

J.Troll 26 12 26

L.Tansley 30 12 28

4.修改文本域

awk '{if($1=="J.Troll") ($1="J.Troll.L");print $1}' grade.txt

M.Tansley

J.Lulu

P.Bunny

J.Troll.L

L.Tansley

5.只显示修改记录

awk '{if( $1 == "J.Troll" ) {$1="J.Troll.L"; print $1}' grade.txt

awk: Syntax error

at line 1 of program << {if( $1 == "J.Troll" ... >>

context is

{if( $1 == "J.Troll" ) {$1="J.Troll.L"; print >>> $1} <<<

1 extra {

awk: illegal statement

at line 1 of program << {if( $1 == "J.Troll" ... >>

错误原因：少了一个“}”结束

awk '{if( $1 == "J.Troll" ) {$1="J.Troll.L"; print $1}}' grade.txt

J.Troll.L

6.创建新的域

awk 'BEGIN{ print "Name\t Difference"}

{if($6 < $7) {$8=$7-$6; print $1,$8}}' grade.txt

Name Difference

M.Tansley 4

J.Lulu 2

7.统计数据

awk '(tot += $6); END{print "Club student total points:" tot}' grade.txt

M.Tansley 05/99 48311 Green 8 40 44

J.Lulu 06/99 48317 green 9 24 26

P.Bunny 02/99 48 Yello 12 35 28

J.Troll 07/99 4842 Brown-3 12 26 26

L.Tansley 05/99 4712 Brown-2 12 30 28

Club student total points:155

8.文件长度相加

ls -l | awk ' /^[^d]/ {print $9"\t"$5} {tot += $5}

END {print "total KB:"tot}'

cat 0

cat_file.txt 28

data.f 356

delete_me_and_die 284

first2 61

grade.txt 235

info.txt 354

myfile 23

test.bak 225

test.sql 225

who.out 1998

wow 229

total KB:4018

查看当前目录下的所有文件：

ls -l

total 24

-rw-r--r-- 1 xxxx group 0 Nov 19 10:12 cat

-rw-r--r-- 1 xxxx group 28 Nov 14 20:32 cat_file.txt

-rw-r--r-- 1 xxxx group 356 Nov 16 19:50 data.f

-rw-r--r-- 1 xxxx group 284 Nov 19 10:36 delete_me_and_die

-rwxr--r-- 1 xxxx group 61 Nov 8 09:15 first2

-rw-r--r-- 1 xxxx group 235 Nov 19 10:44 grade.txt

-rwxr--r-- 1 xxxx group 354 Nov 17 11:05 info.txt

-rwxr----- 1 xxxx group 23 Nov 7 19:12 myfile

-rwxr--r-- 1 xxxx group 225 Nov 15 18:08 test.bak

-rwxr--r-- 1 xxxx group 225 Nov 15 14:12 test.sql

-rw-r--r-- 1 xxxx group 1998 Nov 15 14:15 who.out

-rw-r--r-- 1 xxxx group 229 Nov 19 14:44 wow

--the end--

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