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Most people do not understand the knowledge points of this article "string interception methods in linux", so the editor summarizes the following contents, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "what are the methods of string interception in linux".

String interception in Linux is very useful, and there are eight ways.

Suppose there is a variable var= https://www..com/123.htm

1. # intercept, delete the left character and retain the right character.

Echo ${var#*//}

Where var is the variable name, the # sign is the operator, and * / / means to delete the first / / sign and all characters on the left from the left.

That is, delete http://

The result is: www..com/123.htm

2. # # intercepts, deletes the left character and retains the right character.

Echo ${var##*/}

# # * / deletes the last (rightmost) / sign and all characters on the left from the left

That is, delete https://www..com/

The result is 123.htm.

3.% intercept, delete the right character and keep the left character

Echo ${var%/*}

% / * means to start on the right and delete the first / sign and the characters on the right

The result is: https://www..com

4.%% intercept, delete the right character, keep the left character

Echo ${var%%/*}

%% / * means to start from the right and delete the last (leftmost) / sign and the right character

The result is: http:

5. Start with the number of characters on the left and the number of characters

Echo ${var:0:5}

Where 0 indicates the beginning of the first character on the left, and 5 represents the total number of characters.

The result is: http:

6. Start with the first character on the left and go to the end.

Echo ${var:7}

Seven of them indicates the beginning of the eighth character on the left and the end.

The result is: www..com/123.htm

7. Start with the number of characters on the right and the number of characters

Echo ${var:0-7:3}

The 0-7 represents the seventh character on the right, and 3 indicates the number of characters.

The result is: 123

8. Start with the first character on the right and go to the end.

Echo ${var:0-7}

Indicates that it starts with the seventh character on the right and ends.

The result is: 123.htm

Note: (the first character on the left is represented by 0, and the first character on the right is represented by 0-1)

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