sed 使用教程 - 通读篇（30分钟入门系列）

sed [option] 'script' file1 file2 ...
sed [option] -f scriptfile file1 file2 ..

# 文件内容来自网上一个教程
shell> cat sed.txt
This is my cat
  my cat's name is betty
This is my dog
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam

shell> sed 's/This/That/g' sed.txt 
That is my cat
  my cat's name is betty
That is my dog
  my dog's name is frank
That is my fish
  my fish's name is george
That is my goat
  my goat's name is adam

shell> cat line.txt
1 line
2 line
3 line
4 line
5 line
6 line
7 line
8 line

shell> sed -n '3p' line.txt
3 line

# 打印最后一行
shell> sed -n '$p' line.txt
8 line

# 打印从某行开始到最后一行
 sed -n '6,$p' line.txt
6 line
7 line
8 line

# 打印第三行及下面2行
shell>  sed -n '3,+2p' line.txt
3 line
4 line
5 line

# 打印奇数行
shell> sed -n '1~2 p' line.txt  
1 line
3 line
5 line
7 line

shell> sed -n '/2/p' line.txt
2 line

# 和数字使用
shell> sed -n '/2/,3p' line.txt
2 line
3 line

# 和 + 号使用
shell> sed -n '/2/,+3p' line.txt
2 line
3 line
4 line
5 line 

shell>  sed -n '/2/,/5/p' line.txt
2 line
3 line
4 line
5 line

shell> cat html.txt
<b>This</b> is what <span style="text-decoration: underline;">I</span> meant. Understand?
shell> sed 's/<[^>]*>//g' html.txt
This is what I meant. Understand?

shell> sed '1i This is test file!' sed.txt  
This is test file!
This is my cat
  my cat's name is betty
This is my dog
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam

sed '/fish/,+3i ------------!' sed.txt
This is my cat
  my cat's name is betty
This is my dog
  my dog's name is frank
------------!
This is my fish
------------!
  my fish's name is george
------------!
This is my goat
------------!
  my goat's name is adam

shell> cat sed.txt 
This is my cat
  my cat's name is betty
This is my dog
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam
This is my cat
  my goat's name is adam
This is my goat
This is my fish
  my fish's name is george

sed '/cat/,+2i ------------!' sed.txt
------------!
This is my cat
------------!
  my cat's name is betty
------------!
This is my dog
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam
------------!
This is my cat
------------!
  my goat's name is adam
------------!
This is my goat
This is my fish
  my fish's name is george

shell> sed '/cat/,+2a ------------!' sed.txt
This is my cat
------------!
  my cat's name is betty
------------!
This is my dog
------------!
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam

shell> sed '/cat/,+2d' sed.txt 
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam

shell> sed '/cat/,+2c replace test' sed.txt
replace test
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam

shell> sed '/cat/,+2w w.txt' sed.txt
This is my cat
  my cat's name is betty
This is my dog
  my dog's name is frank
This is my fish
  my fish's name is george
This is my goat
  my goat's name is adam
 shell> cat w.txt 
This is my cat
  my cat's name is betty
This is my dog

shell> sed 'N; s/\n/,/g' sed.txt
This is my cat,  my cat's name is betty
This is my dog,  my dog's name is frank
This is my fish,  my fish's name is george
This is my goat,  my goat's name is adam

shell> sed 'N; s/i/I/1' sed.txt
ThIs is my cat
  my cat's name is betty
ThIs is my dog
  my dog's name is frank
ThIs is my fish
  my fish's name is george
ThIs is my goat
  my goat's name is adam

shell> sed -n 'N; P' sed.txt
This is my cat
This is my dog
This is my fish
This is my goat

$ cat hello.cpp
#include <iostream> 
using namespace std; 
int main(void) 
{ 
   // Displays message on stdout. 
   cout >> "Hello, World !!!" >> endl;  
   return 0; // Return success. 
}

$ sed 's|//.*||g' hello.cpp
#include <iostream>
using namespace std;
int main(void)
{

   cout >> "Hello, World !!!" >> endl;
   return 0;
}

$ echo -e "Line #1\nLine #2\nLine #3" | grep 'Line #1'
Line #1
$ echo -e "Line #1\nLine #2\nLine #3" | sed -n '/Line #1/p'
Line #1

$ echo -e "Line #1\nLine #2\nLine #3" | grep -v 'Line #1'
Line #2
Line #3
$ echo -e "Line #1\nLine #2\nLine #3" | sed -n '/Line #1/!p'
Line #2
Line #3

$ cat html.txt
<html>
<head>
    <title>This is the page title</title>
</head>
<body>
    <p> This is the <b>first</b> line in the Web page.
    This should provide some <i>useful</i> information to use in our sed script.
</body>
</html>                                                                                  
$ sed 's/<[^>]*>//g ; /^$/d' html.txt
    This is the page title
     This is the first line in the Web page.
    This should provide some useful information to use in our sed script.

$ echo -e "Line #1\n\n\nLine #2" | sed '/^$/d'
Line #1
Line #2

（欢迎各位对文章中的错误指正，另外如果小伙伴们有好的实例来分享，谢谢各位）