Fix bug.

move_site.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 if [ -z "$6" ]; then
 	echo "Usage: $0 ip port username password example.com user_pass";
+	history -c
 	exit 1;
 fi
 ip="$1";
@@ -24,6 +25,7 @@ function escape_slash(){
 if [ "$?" != 0 ]; then
 	echo "Please check the remote server is reachable";
 	unalias sudo_command;
+	history -c
 	exit 1;
 else
 	if [  -z  "$nginx_file" ]; then
@@ -36,6 +38,7 @@ else
 		if [ -z $db_name ]; then
 			echo "There was some error when detecting Database!"
 			unalias sudo_command;
+			history -c
 			exit 1;
 		fi
 		echo "Database name: $db_name";
@@ -98,5 +101,6 @@ else
 		rm -f tmp/unicorn.sock
 		bundle exec unicorn_rails -c config/unicorn.rb -E production
 		echo "Finish moving and installing site!"
+		history -c
 	fi
 fi