您当前的位置: /b/xx 即在目录b下存在一个文件xx，文件xx的内容如下
<Host>
123224rsiskd1
sdfkldsfjkslf2
fdsjlfjlsdf3
fdjsofjs;f4
fjdsfdksfkd5
dsfkjgds6
</Host>
现在，我想在</Host>的前面一行，也就是 dsfkjgds6 和</Host>之间添加一行文字，文字如下
<Valve className ="a.b.c.d.e"/>
请问应该如何写？
------解决方案--------------------
- Assembly code
[root@RHEL6A tmp]# cat data7.txt
<Host>
123224rsiskd1
sdfkldsfjkslf2
fdsjlfjlsdf3
fdjsofjs;f4
fjdsfdksfkd5
dsfkjgds6
</Host>
[root@RHEL6A tmp]# awk '{if ($0=="<Host>") printf("%s\n<Valve className =\"a.b.c.d.e\"/>\n",$0);else print $0}' data7.txt
<Host>
<Valve className ="a.b.c.d.e"/>
123224rsiskd1
sdfkldsfjkslf2
fdsjlfjlsdf3
fdjsofjs;f4
fjdsfdksfkd5
dsfkjgds6
</Host>
[root@RHEL6A tmp]#