复习sed命令

1.使用&命令附加修改字符
[root@acer shell_learning]# cat   quote.txt |  grep  "nurse"
The local nurse Miss P.Neave was in attendance
[root@acer shell_learning]# sed  -n 's/nurse/"Hello" &/p'   quote.txt
The local "Hello" nurse Miss P.Neave was in attendance
[root@acer shell_learning]# sed -n  's/nurse/& "Hello"/p' quote.txt
The local nurse "Hello" Miss P.Neave was in attendance
由此可以知道&代替原来的字符“nurse”，如此一来，它前后要加字符就好说了。