netcat命令无效参数e的解决方案

	nc: invalid option — ‘e’
	This is nc from the netcat-openbsd package. An alternative nc is available
	in the netcat-traditional package.

	$ sudo rm /etc/alternatives/nc && sudo ln -s /bin/nc.traditional /etc/alternatives/nc

	$ ls -ld /bin/nc

	lrwxrwxrwx 1 root root 20 12月 11  2014 /bin/nc -> /etc/alternatives/nc

	$ ls -ld /etc/alternatives/nc

	lrwxrwxrwx 1 root root 19 12月 29 17:10 /etc/alternatives/nc -> /bin/nc.traditional