sed是一個很強(qiáng)大的文件處理工具，主要是以行為單位進(jìn)行處理，可以將數(shù)據(jù)行進(jìn)行替換、刪除、新增、選取等特定工作
格式：sed [option] [command] [file]
常用命令：
a ∶新增
c ∶取代
d ∶刪除
i ∶插入
p∶列印
s∶取代
選項(xiàng)：
-i∶直接修改讀取的檔案內(nèi)容，而不是由螢?zāi)惠敵觥?/p>
-n∶使用安靜(silent)模式。在一般 sed 的用法中，所有來自 STDIN的資料一般都會被列出到螢?zāi)簧稀５绻由?-n 參數(shù)后，則只有經(jīng)過sed 特殊處理的那一行(或者動作)才會被列出來。
１，sed '1d' ghostwu.com d代表刪除 d前面的數(shù)字代表刪除第一行，該命令不會修改文件本身
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，刪除最后一行，$代表最后一行
ghostwu@dev:~/linux/sed$ 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 '$d' ghostwu.txt this is ghostwu how are you hod old are you and you fine thank you
３，刪除第一行到第二行
ghostwu@dev:~/linux/sed$ 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，刪除第二行到最后一行
ghostwu@dev:~/linux/sed$ sed '2,$d' ghostwu.txt this is ghostwu
５，查找包含'you'的行，/you/ 這是正則表達(dá)式， p是打印，要跟n結(jié)合起來用
ghostwu@dev:~/linux/sed$ 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
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