add script to sort words

sort_words.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+cp words.txt bck.words.txt
+
+if [ $? -eq 0 ]; then
+    tr '[:lower:]' '[:upper:]' < words.txt | sort -u > words_tmp.txt
+    mv words_tmp.txt words.txt
+
+    echo "Done"
+else
+    echo "Fail"
+fi