Move OS X and Linux pages into pages/common

common/lsof.md

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+# lsof
+
+> Lists open files and the corresponding processes
+
+- find the processes that have a given file open
+
+`lsof {{/path/to/file}}`
+
+- find the process that opened a local internet port
+
+`lsof -i :{{8080}}`
+
+- only output the process PID (e.g. to pipe into kill)
+
+`lsof -t {{/path/to/file}} | xargs kill -9`