1.2 字符串处理

计算字符串长度

#!/bin/bash
var1="hello world"
len=${#var1}
echo $len # 11

#!/bin/bash
var1="hello world"
len=`expr length "$var1"`
echo $len # 11

获取字串在字符串中的索引位置

#!/bin/bash
var1="hello world"
position=`expr index "$var1" wo`
echo $position # 5

#!/bin/bash
var1="hello world"
position=`expr match "$var1" wo`
echo $position # 0

#!/bin/bash
var1="hello world"
position=`expr match "$var1" .*wo`
echo $position # 8

抽取字串