Merge pull request #145 from nguyenchr/add-nc

add nc

common/nc.md

@@ -0,0 +1,23 @@
+# nc
+
+> reads and writes tcp or udp data
+
+- listen on a specified port
+
+`nc  -l {{port}}`
+
+- connect to a certain port (you can then write to this port)
+
+`nc {{ip_address}} {{port}}`
+
+- set a timeout 
+
+`nc -w {{timeout_in_seconds}} {{ipaddress}} {{port}}`
+
+- serve a file
+
+`cat somefile.txt | nc -l {{port}}`
+
+- receive a file
+
+`nc {{ip_address}} {{port}} > somefile.txt`