1. 更改行:工作方式与插入命令相同。

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     (1)sed ' 3c\
        > This is a test. '#更改第三行中的文本。
    (2)sed '/number 3/c\
        > This is a changed line of text.' fiel #寻址匹配文本模式
    (3)sed '2,3c\
        >This is a new line of text. ' file #在更改命令中,可以使用地址范围,但使用单一文本行替换范围行。
    
  2. 变换命令:[address]y/inchars/outchars/变换命令(y)是唯一对单个字符进行操作的sed编辑器命令。变换命令将inchars和outchars的值进行一对一映射。将inchars中的第一个字符转换为outchars中的第一个字符。将inchars中的第二个字符转换为outchars中的第二个字符。这样的映射一直持续到完成指定的字符长度。如果inchars和outchars的长度不同,sed编辑器将生成错误消息。变换命令是全局命令,自动对文本发现的任意字符进行转换。

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      $cat data
      This is line number 1
This is line number 2
This is line number 3
This is line number 4
This is line number 5
This is line number 6
This is line number 7
This is line number 8
This is line number 9
This is line number 10
This is line number 11
This is line number 12
This is line number 1 again
This is yet another line
This is the last line in the file
      $sed 'y/123/opq/' data
This is line number o
This is line number p
This is line number q
This is line number 4
This is line number 5
This is line number 6
This is line number 7
This is line number 8
This is line number 9
This is line number o0
This is line number oo
This is line number op
This is line number o again
This is yet another line
This is the last line in the file
  ```

8. 打印命令:
1. 打印文本行的p命令(打印数据流中部分行,改变某行之前查看该行。)
        $sed -n '/3/{
        > p
        > s/line/test/p
        > ' data
        This is line number 3
        This is test number 3
        #先搜索包含数字3的行,然后执行两个命令。首先,脚本使用p命令打印该行的原始版本,然后使用s命令替换文本,并使用p标记打印最终得到的文本。输出显示了原来的行文本和新的行文本。
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2. 打印行号的=命令
   ```
           $ sed -n '/number 4/{
           > =
           > p
           } ' data
           4
           This is line number 4.
     ```
3. 列出行的l命令:允许打印数据流中的文本和不可打印的ASCII字符。

 9. 写文件w命令:`[address]w filename`filename可以指定为相对或绝对路径,但在任意一种情况下,运行sed编辑器的用户必须对该文件有写权限。
    $ sed '1,2w test' data
    This is line nuumber 1.
    This is line number 2.
    This is line number 3.
    This is line number 4.
    $ cat test
    This is line number 1.
    This is line number 2.
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10. 从文件读取数据r命令:`[address]r filename`filename参数可以为包含数据的文件指定相对或绝对路径。对于读命令,不能时欧诺个地址范围。只能指定点哪一的行号或文本模式地址。sed编辑器在该地址后插入文件中的文本。**读命令的一个很好的用途是和删除命令一起使用,用另一个文件中的数据替代一个文件中的占位符。**
    $cat data
    This is an added line.
    This is the second added line.
    $sed '3r data' data
    This is line number1
    This is line number2
    This is an addes line.
    This is the second added line.
```