grep命令抓取问题
时间：2011-03-09
来源：互联网
- [root@localhost python]# nc -v -z -w2 192.168.1.203 1-21
- nc: connect to 192.168.1.203 port 13 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 14 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 15 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 16 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 17 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 18 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 19 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 20 (tcp) failed: Connection refused
- Connection to 192.168.1.203 21 port [tcp/ftp] succeeded!
我只想让它显示成功信息用grep抓关键字 'succeeded!'
结果是：跟上图一样！
- [code][root@localhost python]# nc -v -z -w2 192.168.1.203 1-21|grep 'succeeded!'
- nc: connect to 192.168.1.203 port 13 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 14 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 15 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 16 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 17 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 18 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 19 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 20 (tcp) failed: Connection refused
- Connection to 192.168.1.203 21 port [tcp/ftp] succeeded!
反过来选择，我忽略refused
结果：还是一样！真是奇了个怪了。
- [root@localhost python]# nc -v -z -w2 192.168.1.203 1-21|grep -v 'refused'
- nc: connect to 192.168.1.203 port 1 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 2 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 3 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 4 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 5 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 6 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 7 (tcp) failed: Connection refused
- nc: connect to 192.168.1.203 port 8 (tcp) failed: Connection refused
- Connection to 192.168.1.203 21 port [tcp/ftp] succeeded!
作者: skyxue215 发布时间: 2011-03-09
那个是 “标准错误输出”stderr 输出的。
作者: jerryjzm 发布时间: 2011-03-09
回复 jerryjzm
谢了兄弟
谢了兄弟
作者: skyxue215 发布时间: 2011-03-09
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