Linux里awk中split函数的用法小结

The awk function split(s,a,sep) splits a string s into an awk array a using the delimiter sep.

set time = 12:34:56

set hr = `echo $time | awk {split($0,a,”:” ); print a[1]}` # = 12

set sec = `echo $time | awk {split($0,a,”:” ); print a[3]}` # = 56

# = 12 34 56

set hms = `echo $time | awk {split($0,a,”:” ); print a[1], a[2], a[3]}`

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Q:

name=”76868&5676&435&43526&334&12312312&12321″

awk BEGIN {print split(“$name”, filearray, “&”)}

为什么是1

而

awk BEGIN {print split(“76868&5676&435&43526&334&12312312&12321”, filearray, “&”)}

则返回正确的结果，应该是7，有没有人解答一下？

A:

变量引用错误，这样做试试

awk BEGIN {print split(“”$name””, filearray, “&”)}

awk规定引用系统变量必须使用单引号加双引号，即”$sysvar”这样的格式，但是split函数也需要双引号来定界，但这个双引号又不能让sh解释，而应留给awk来解释，所以使用了”和”组成的双引号

split函数的用法

he awk function split(s,a,sep) splits a string s into an awk array a using the delimiter sep.

set time = 12:34:56

set hr = `echo $time | awk {split($0,a,”:” ); print a[1]}` # = 12

set sec = `echo $time | awk {split($0,a,”:” ); print a[3]}` # = 56

# = 12 34 56

set hms = `echo $time | awk {split($0,a,”:” ); print a[1], a[2], a[3]}`

set hms = `echo $time | awk {split($0,a,”:” ); for (i=1; i<=3; i++) print a[i]}`

实例一：

cat a

a:b:c:d:e:f:g:h:i

使用awk将该字符串冒号两边的段输出

cat a |awk -F: {split($0,arr,”:”)}END{for(i=1;i<=NF;i++)printf(“%sn”,arr[i])}

输出结果如下

a

c

d

e

f

g

h

i