create/update 'Almost line-speed file-copy using netcat.md' file

Almost line-speed file-copy using netcat.md

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+# Almost line-speed file-copy using netcat
+
+Receiving end:
+
+```shell
+nc -l -p 9999 | tar xvfp -
+```
+
+Sender:
+
+```shell
+tar cfp - /PATH/ | nc RECEIVER 9999
+```