Adding cache purging feature, help message, and version printing option

pronounce

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+PRONOUNCE_VERSION="1.1.0"
+
 echo -e "\e[0;32m"
 echo "The pronounce: Frontend for English Words Pronunciation"
 echo "Copyright © 2013  Behnam Momeni"
@@ -73,7 +75,22 @@ function run_external_program {
 
 }
 
-if [ "a$2" = "a" ]; then
+if [ "$1" = "-h" ]; then
+	echo -e "Usage: \e[1;33m"
+	echo -e "\t<word>          Plays 1st pronunciation of <word>"
+	echo -e "\t<word> <num>    Plays <num>-th pronunciation of <word>"
+	echo -e "\t<word> f        Opens definition page of <word> in Mozilla Firefox"
+	echo -e "\t<word> w        Opens definition page of <word> in w3m command line browser"
+	echo -e "\t-c              Purges the local audio files cache (rm -f)"
+	echo -e "\t-v              Prints version"
+	echo -e "\t-h              Prints this message"
+	echo -e "\e[0m"
+elif [ "$1" = "-c" ]; then
+	echo "Purging the cache"
+	rm -f ~/pronunciation.wavs/*
+elif [ "$1" = "-v" ]; then
+	echo "Version: $PRONOUNCE_VERSION"
+elif [ "a$2" = "a" ]; then
 	main $1 1
 elif [ "$2" = "f" ]; then
 	run_external_program firefox "http://www.merriam-webster.com/dictionary/$1#headword"