Linux ed command

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The Linux ed command is a text editor used for text editing.

ed is the simplest text editing program in Linux, which can only edit one line at a time rather than operate in a full-screen mode.

The ed command is not a commonly used command; the vi command is generally used more often. However, the ed text editor is very useful for editing large files or for text editing in shell script programs.

Syntax

ed　[-][-Gs][-p<string>][--help][--version][file]

Parameters:

• -G or--traditional　　Provides backward compatibility features.

• -p<string>　　Specifies the prompt character for ed in command mode.

• -s,-,--quiet or--silent　　Does not execute the check function when opening a file.

• --help　　Displays help.

• --version　　Displays version information.

Online Example

This is a complete example analysis of the Linux ed command:

$　ed　　　　　　　　　　　　　　<-　Activate ed command　
a<-　Tell ed that I want to edit a new file　
My name is Titan.<-　Enter the first line content　
And I love Perl very much.<-　Enter the second line content　
.<-　Return to the command line state of ed　
i<-　Tell ed that I want to insert content before the last line　
I am　24-　　24,　
.<-　Return to the command line state of ed　
c<-　Tell ed that I want to replace the last input content　
I am　24　years old.<-　　24,　24　years old.”(note: here, the last input is replaced)　
.<-　Return to the command line state of ed　
w readme.text<-　Rename the file to 'readme.text' and save (note: if it is editing an existing file, just type 'w' is enough)　
q<-　Completely exit the ed editor

The content of the file is:

$ cat readme.text　
My name is Titan.　
I am　24　years old.　
And I love Perl very much.

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