How to modify and save files in linux

First open the command console and find the file to be edited. Execute the command ls to see how many files there are below. I have an index.php file below

Then execute the commandvi index.php

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If you want to modify the content of this file at this time, press the 'i' key on the keyboard, and the bottom will change to INSERT, and you can modify it

Write an echo code to save Esc: wq This is to save, press Enter to save

After the saving is completed, open the file again and you will find that you have just The written code has been saved inside.

Command not to save Esc: q! This is not to save

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