hexdump, logger, netstat, n, nm, pdfgrep: move to common (#6549)

pages/common/netstat.md

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+# netstat
+
+> Displays network-related information such as open connections, open socket ports, etc.
+> More information: <https://man7.org/linux/man-pages/man8/netstat.8.html>.
+
+- List all ports:
+
+`netstat --all`
+
+- List all listening ports:
+
+`netstat --listening`
+
+- List listening TCP ports:
+
+`netstat --tcp`
+
+- Display PID and program names:
+
+`netstat --program`
+
+- List information continuously:
+
+`netstat --continuous`
+
+- List routes and do not resolve IP addresses to hostnames:
+
+`netstat --route --numeric`
+
+- List listening TCP and UDP ports (+ user and process if you're root):
+
+`netstat --listening --program --numeric --tcp --udp --extend`