file transfer with nc command on Linux
1、先在receiver上使用nc监听端口（6543），并将接收的内容都重定向到文件里（out.file）
nc -lvp 6543 > out.file
2、在sender上将文件发送至receiver机器的端口上
nc -q 1 ip 6543 < in.file
为了能够自动退出，增加里-q选项
-q seconds after EOF on stdin, wait the specified number of seconds
and then quit. If seconds is negative, wait forever.
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