linux -- sed命令

作用

sed命令可以根据一套规则编辑数据！

#test.txt原本内容
[dmadmin@DEMPSRV2 test]$ cat test.txt
jason ia handsome!
kevin is handsome too!
other are not!

 

替换命令：s

# handsome:需要被替换的文本； cool：替换后的文本   g:全部替换
[dmadmin@DEMPSRV2 test]$ sed 's/handsome/cool/g' test.txt
jason ia cool!
kevin is cool too!
other are not!

 

#源文件
[dmadmin@DEMPSRV2 test]$ cat equals.xml
name = jason
address = shenzhen
#“ =”改成“=”
[dmadmin@DEMPSRV2 test]$ sed -i 's/ =/=/g' equals.xml
[dmadmin@DEMPSRV2 test]$ cat equals.xml
name= jason
address= shenzhen

 

删除命令：d

# 删除第二行数据
[dmadmin@DEMPSRV2 test]$ sed '2d' test.txt
jason ia handsome!
other are not!

 

在指定行后面加一行a, 在指定行前面加一行i

# 在第二行后面加一行new line      如果你想将一个多行数据添加到数据流中，只需对要插入或附加的文本中的每一行末尾（除最后一行）添加反斜线即可
[dmadmin@DEMPSRV2 test]$ sed '2a\
> new line' test.txt
jason ia handsome!
kevin is handsome too!
new line
other are not!


# 在第二行前面加一行“new line before 2.”     
[dmadmin@DEMPSRV2 test]$ sed '2i\
> new line before 2.' test.txt
jason ia handsome!
new line before 2.
kevin is handsome too!
other are not!

 

指定行内容替换成写入的信息：c

# 第2行替换成change to life
[dmadmin@DEMPSRV2 test]$ sed '2c\
> change to life
> ' test.txt
jason ia handsome!
change to life
other are not!