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Bash基本字符串操作

一、取得字符串长度

${#string}

二、得到子字符串的位置

` expr index “$str” “$substr” `

三、取得字符串的子串

` expr ${str:3} `

` expr ${str:3:3} `

` expr substr “$str” 3 `

` expr substr “$str” 3 3 `

四、替换字符串

` expr ${str/oldsubstr/newsubstr} `

` expr ${str//oldsubstr/newsubstr} `

五、代码

#! /bin/bash

stringZ=abcdefghijklmnop

######Get string length

echo "Output stringZ length:"

echo ${#stringZ}

##result

#Output stringZ length:

#16

#######Get substring position

echo "def is at the index:"

echo `expr index "$stringZ" "def"`

substr=mno

echo `expr index "$stringZ" "$substr"`

##result

def is at the index:

4

13

#########Get substing

echo `expr ${stringZ:3}`

echo `expr ${stringZ:3:5}`

#echo `expr substr "$stringZ" 2 `

echo `expr substr "$stringZ" 2 3 `

###result

#defghijklmnop

#defgh

#bcd

##########Replace substring

stringZ=abcdefgabc

echo `expr ${stringZ/abc/ABC}`

echo `expr ${stringZ//abc/ABC}`

###result

#ABCdefgabc

#ABCdefgABC