Move pages back into a "pages" folder

pages/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}}`
+
+- Show process(es) that using socket
+
+`ss -p`
+
+- Filter TCP sockets by states, only/exclude
+
+`ss {{state/exclude}} {{bucket/big/connected/synchronized/...}}`
+
+- Filter sockets by address and/or port
+
+`ss -t dst 1.2.3.4:80`
+`ss -u src 127/8`
+`ss -t 'dport >= :1024'`
+`ss -x "src /tmp/.X11-unix/*"`
+`ss -t state established '( dport = :ssh or sport = :ssh )'`
+
+- Only list IPv4 or IPv6 sockets
+
+`ss {{-4/-6}}`