String interception of shell scripts under Linux

1 #!/bin/bash

2

3 str= "Http://www.baidu.com/test.htm"

4

5 #echo ${str}

The result of the operation is:http://www.baidu.com/test.htm

Method One: #截取, delete the left character, leave the right character

Echo ${str#*//}

#*//means to delete the first//number and all characters on the left from the left, that is, delete http://

The result of the operation is:www.baidu.com/test.htm

Method Two: # #截取, delete the left character, leave the right character

Echo ${str##*/}

##*/means to delete the last/(i.e. rightmost/) and all characters on the left

The result of the operation is: test.htm

Method Three:% intercept, delete right character, preserve left character

Echo ${str%/*}

%/* means to remove all characters from the first/and right, starting at the far right

The result of the operation is:http://www.baidu.com

Method Four: Percent intercept, delete the right character, leave the left character

Echo ${str%%/*}

%%/* means delete the last/(leftmost/start) and all characters to the right starting from the right

Run Result:http:

Method Five: Start with the first few characters on the left and the number of characters

Echo ${str:0:5}

0 means starting with the first character on the left and 5 representing the total number of characters

The result of the operation is:http:

Method Six: Start from the first character of the coordinates until the end of the string

Echo ${str:7}

7 means starting from the eighth character of a string until the end of the string

The result of the operation is:www.baidu.com/test.htm

Method Seven: Start with the first few characters on the right and the number of characters

Echo ${str:0-7:3}

0-7 means starting with the first character on the right and 3 representing the number of characters

Run Result:est

Method Eight: Start from the first character on the right to the end

Echo ${str:0-7}

Starts at the seventh character on the right, until the end

The result of the operation is:est.htm

String interception of shell scripts under Linux