sed是一个很强大的文件处理工具，主要是以行为单位进行处理，可以将数据行进行替换、删除、新增、选取等特定工作
格式：sed [option] [command] [file]
常用命令：
a ∶新增
c ∶取代
d ∶删除
i ∶插入
p ∶列印
s ∶取代
选项：
-i∶直接修改读取的档案内容，而不是由萤幕输出。
-n∶使用安静(silent)模式。在一般 sed 的用法中，所有来自 STDIN的资料一般都会被列出到萤幕上。但如果加上 -n 参数后，则只有经过sed 特殊处理的那一行(或者动作)才会被列出来。
１，sed ‘1d‘ ghostwu.com d代表删除 d前面的数字代表删除第一行，该命令不会修改文件本身
ghostwu@dev:~/linux/sed$ cat -n ghostwu.txt 1 this is ghostwu 2 how are you 3 hod old are you 4 and you 5 fine thank you 6 come with me!!! ghostwu@dev:~/linux/sed$ sed‘1d‘ ghostwu.txt how are you hod old are you and you fine thank you come with me!!! ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you hod old are you and you fine thank you come with me!!!
２，删除最后一行，$代表最后一行
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you hod old are you and you fine thank you come with me!!! ghostwu@dev:~/linux/sed$ sed‘$d‘ ghostwu.txt this is ghostwu how are you hod old are you and you fine thank you
３，删除第一行到第二行
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you hod old are you and you fine thank you come with me!!! ghostwu@dev:~/linux/sed$ sed‘1,2d‘ ghostwu.txt hod old are you and you fine thank you come with me!!!
４，删除第二行到最后一行
ghostwu@dev:~/linux/sed$ sed‘2,$d‘ ghostwu.txt this is ghostwu
５，查找包含‘you‘的行， /you/ 这是正则表达式， p是打印，要跟n结合起来用
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you hod old are you and you fine thank you come with me!!! ghostwu@dev:~/linux/sed$ sed -n ‘/you/p‘ ghostwu.txt how are you hod old are you and you fine thank you
６，匹配$符号结尾的行
$符号在正则表达式表示行尾，所以要用 转义
ghostwu@dev:~/linux/sed$ sed -n ‘/$/p‘ ghostwu.txt 50$
７，在第一行后面，增加一行“你好啊"
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you hod old are you and you fine thank you come with me!!! how much do you have 50$ oh, is it? yes ghostwu@dev:~/linux/sed$ sed‘1a 你好啊‘ ghostwu.txt this is ghostwu 你好啊 how are you hod old are you and you fine thank you come with me!!! how much do you have 50$ oh, is it? yes
８，在第一行和第二行的后面，增加一行
ghostwu@dev:~/linux/sed$ sed‘1,2a learning how to use sed command‘ ghostwu.txt this is ghostwu learning how to use sed command how are you learning how to use sed command fine thank you
９，也可以增加多行
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you fine thank you ghostwu@dev:~/linux/sed$ sed‘1a 你好啊n很高兴认识你‘ ghostwu.txt this is ghostwu 你好啊 很高兴认识你 how are you fine thank you
10, c为替换操作，数字的意思，跟上面的a一样，代表行
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you fine thank you ghostwu@dev:~/linux/sed$ sed‘1,2c hey guy‘ ghostwu.txt hey guy fine thank you ghostwu@dev:~/linux/sed$ sed‘1c hey guy‘ ghostwu.txt hey guy how are you fine thank you
11, s:替换匹配到的内容， s:替换开始 /is/ 匹配包含is的行 g:全部替换
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you fine thank you ghostwu@dev:~/linux/sed$ sed‘s/is/IS/‘ ghostwu.txt thIS is ghostwu how are you fine thank you ghostwu@dev:~/linux/sed$ sed‘s/is/IS/g‘ ghostwu.txt thIS IS ghostwu how are you fine thank you ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you fine thank you
12、-i :修改，插入文件，会影响文件的内容，在最后一行，插入bye bye
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you fine thank you ghostwu@dev:~/linux/sed$ sed -i ‘$a bye bye‘ ghostwu.txt ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you fine thank you bye bye
13，在1-3行，每一行的后面都插入一行数字
ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu how are you fine thank you bye bye ghostwu@dev:~/linux/sed$ sed -i ‘1,3a 123457‘ ghostwu.txt ghostwu@dev:~/linux/sed$ cat ghostwu.txt this is ghostwu 123457 how are you 123457 fine thank you 123457 bye bye
原文：https://www.cnblogs.com/ghostwu/p/9069837.html
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