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What is sed in linux? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

Sed in linux is a non-interactive character stream-oriented editor. Sed can handle the contents of multiple files and multiple lines at the same time, and input the entire file to the screen without changing the original file. Sed command format: [sed [option] 'sed command'filename].

Sed introduction

Sed:Stream Editor text stream editing, sed is a "non-interactive" character stream-oriented editor. Sed can handle the contents of multiple files and multiple lines at the same time, you can input the whole file to the screen without changing the original file, and you can input the content that only matches the pattern to the screen. You can also make changes to the original file, but the results are not returned on the screen.

The syntax format of the sed command:

The command format of sed:

Sed [option] 'sed command'filename

Script format for sed:

Sed [option]-f 'sed script'filename

Options for the sed command (option):

-n: print only lines that match the pattern

-e: edit sed actions directly on the command line mode, which is the default option

-f: write the actions of sed in a file, and use-f filename to execute sed actions in filename.

-r: support for extended expressions

-I: modify the file content directly

Let's take a look at how to use it, as shown in the figure:

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