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+====== Remove Mutli-Blank lines ======
+When we coding and can found there has some blank lines, so we need to remove them but just keep one blank line.
+So here has some solutions
+  * cat -s
+  * sed 'N;/^\n$/D;P;D;'
+  * for i in *; do FILE=$(cat -s "$i"); echo "$FILE" > "$i"; done
+===== Refer =====
+  * https://stackoverflow.com/questions/922449/how-can-i-replace-multiple-empty-lines-with-a-single-empty-line-in-bash
+  * https://stackoverflow.com/questions/922449/how-can-i-replace-multiple-empty-lines-with-a-single-empty-line-in-bash/934451#934451