Add tail.md

common/tail.md

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+# tail
+
+> Display the last part of a file
+
+- show last 'num' lines in file
+
+`tail -n {{num}} {{file}}`
+
+- show last 'num' bytes in file
+
+`tail -c {{num}} {{file}}`
+
+- keep reading file until ctrl-c
+
+`tail -f {{file}}`