Update cheatsheets

tldr/osx/netstat

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# netstat
+
+> Display network-related information such as open connections, open socket ports, etc.
+> More information: <https://keith.github.io/xcode-man-pages/netstat.1.html>.
+
+- Display the PID and program name listening on a specific protocol:
+
+`netstat -p {{protocol}}`
+
+- Print the routing table and do not resolve IP addresses to hostnames:
+
+`netstat -nr`
+
+- Print the routing table of IPv4 addresses:
+
+`netstat -nr -f inet`