add ss.md

linux/ss.md

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+# ss
+
+> Utility to investigate sockets
+
+- Dump all TCP/UDP/RAW/UNIX sockets
+
+`ss -a {{-t/-u/-w/-x}}`
+
+- Filter TCP sockets by states, only/exclude
+
+`ss {{state/exclude}} {{bucket/big/connected/synchronized/...}}`
+
+- Filter sockets by address and/or port
+
+`ss {{dst/src/dport/sport}} {{==/!=/>/</...}} {{prefix:port/unix:STRING/:port/...}}`
+
+- Only list IPv4 or IPv6 sockets
+
+`ss {{-4/-6}}`