AWK

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==常见用法==
 
==常见用法==
 
  gawk '{ sum += $1 }; END { print sum }' file
 
  gawk '{ sum += $1 }; END { print sum }' file
 +
awk '{ print }' /etc/passwd
 +
awk '{ print "" }' /etc/passwd
 +
awk '{ print "huihoo" }' /etc/passwd
 
  gawk -F: '{ print $1 }' /etc/passwd
 
  gawk -F: '{ print $1 }' /etc/passwd
 +
awk -F":" '{ print $1 $3 }' /etc/passwd
 +
awk -F":" '{ print $1 " " $3 }' /etc/passwd
 +
awk -F":" '{ print "username: " $1 "\t\tuid:" "$3" }' /etc/passwd
 +
awk 'END {print NR}' html.c // 获得 html.c文件的行数
 +
Print first two fields in opposite order:
 +
  awk '{ print $2, $1 }' file
 +
Print lines longer than 72 characters:
 +
  awk 'length > 72' file
 +
Print length of string in 2nd column
 +
  awk '{print length($2)}' file
 +
Print fields in reverse order:
 +
  awk '{ for (i = NF; i > 0; --i) print $i }' file
 +
Print all lines between start/stop pairs:
 +
  awk '/start/, /stop/' file
 +
Print column 3 if column 1 > column 2:
 +
  awk '$1 > $2 {print $3}' file
 +
Print line if column 3 > column 2:
 +
  awk '$3 > $2' file
 +
Count number of lines where col 3 > col 1
 +
  awk '$3 > $1 {print i + "1"; i++}' file
 +
Print sequence number and then column 1 of file:
 +
  awk '{print NR, $1}' file
 +
Print every line after erasing the 2nd field
 +
  awk '{$2 = ""; print}' file
 +
Print hi 28 times
 +
  yes | head -28 | awk '{ print "hi" }'
 +
Print hi.0010 to hi.0099 (NOTE IRAF USERS!)
 +
  yes | head -90 | awk '{printf("hi00%2.0f \n", NR+9)}'
 +
Print out 4 random numbers between 0 and 1
 +
  yes | head -4 | awk '{print rand()}'
 +
Print out 40 random integers modulo 5
 +
  yes | head -40 | awk '{print int(100*rand()) % 5}'
 +
 
==Links==
 
==Links==
 
*AWK用法简介 - http://clayboy1.blogchina.com/clayboy1/3461065.html
 
*AWK用法简介 - http://clayboy1.blogchina.com/clayboy1/3461065.html

2007年2月1日 (四) 21:32的版本

AWK是Unix平台上一种可以对文本进行逐行处理的编程语言，它来源于3个创作者的名字：Aho、(Peter)Weinberg和(Brain)Kernighan. 与sed和grep很相似，awk是一种样式扫描与处理工具，但其功能却大大强于sed和grep。awk提供了极其强大的功能：它几乎可以完成grep和sed所能完成的全部工作，同时，它还可以可以进行样式装入、流控制、数学运算符、进程控制语句甚至于内置的变量和函数。awk的三位创建者已将它正式定义为：样式扫描和处理语言。

目录

GNU Awk

gawk - GNU awk, a pattern scanning and processing language 

apt-get install gawk

Mawk

mawk - a pattern scanning and text processing language 

apt-get install mawk

常见用法

gawk '{ sum += $1 }; END { print sum }' file
awk '{ print }' /etc/passwd
awk '{ print "" }' /etc/passwd
awk '{ print "huihoo" }' /etc/passwd 
gawk -F: '{ print $1 }' /etc/passwd
awk -F":" '{ print $1 $3 }' /etc/passwd
awk -F":" '{ print $1 " " $3 }' /etc/passwd
awk -F":" '{ print "username: " $1 "\t\tuid:" "$3" }' /etc/passwd
awk 'END {print NR}' html.c // 获得 html.c文件的行数

Print first two fields in opposite order: 

 awk '{ print $2, $1 }' file

Print lines longer than 72 characters: 

 awk 'length > 72' file

Print length of string in 2nd column 

 awk '{print length($2)}' file

Print fields in reverse order: 

 awk '{ for (i = NF; i > 0; --i) print $i }' file

Print all lines between start/stop pairs: 

 awk '/start/, /stop/' file

Print column 3 if column 1 > column 2: 

 awk '$1 > $2 {print $3}' file

Print line if column 3 > column 2: 

 awk '$3 > $2' file

Count number of lines where col 3 > col 1 

 awk '$3 > $1 {print i + "1"; i++}' file

Print sequence number and then column 1 of file: 

 awk '{print NR, $1}' file

Print every line after erasing the 2nd field 

 awk '{$2 = ""; print}' file

Print hi 28 times 

 yes | head -28 | awk '{ print "hi" }'

Print hi.0010 to hi.0099 (NOTE IRAF USERS!) 

 yes | head -90 | awk '{printf("hi00%2.0f \n", NR+9)}'

Print out 4 random numbers between 0 and 1 

 yes | head -4 | awk '{print rand()}'

Print out 40 random integers modulo 5 

 yes | head -40 | awk '{print int(100*rand()) % 5}'

Links

来自“http://wiki.huihoo.com/wiki/?title=AWK&oldid=12588”
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