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!
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!