rename commands & check for empty argument list

gophed

@@ -19,20 +19,24 @@ usage() {
 	printf "   $0 -h\n"
 	printf "\n"
 	printf "In a gopher page, just type:\n"
-	printf "  !./visit %% LINE\n"
+	printf "  !./g %% LINE\n"
 	printf "to visit the resource at LINE, or:\n"
-	printf "  !./dl %% LINE\n"
+	printf "  !./d %% LINE\n"
 	printf "to download the resource at LINE\n\n"
 	exit 0
 }
 
 trap cleanup INT QUIT HUP KILL ABRT TERM
 
+if [ $# -lt 1 ]; then 
+	usage
+fi
+
 if [ "$1" = "-h" ]; then usage; fi
 
 if [ "$1" = "-i" ]; then 
-	ln -s $0 visit
-	ln -s $0 dl
+	ln -s $0 g
+	ln -s $0 d 
 	exit 0
 fi
 
@@ -44,7 +48,7 @@ if [ "${script_name}" = "gophed" ]; then
 	go "$1" "$2" "$3" > $TMPFILE
 	cat show - show | ed $TMPFILE 
 fi
-if [ "${script_name}"  = "visit" ]; then 
+if [ "${script_name}"  = "g" ]; then 
 		LINE=$(awk "{if (NR == $2) print \$0;}" $1)
 		RESOURCE=$(echo "$LINE" | cut -d '	' -f 2)
 		HOST=$(echo "$LINE" | cut -d '	' -f 3)
@@ -54,7 +58,7 @@ if [ "${script_name}"  = "visit" ]; then
 		go "$RESOURCE" "$HOST" "$PORT" > $TMPFILE
 		cat show - show | ed $TMPFILE
 fi
-if [ "${script_name}" =  "dl" ]; then
+if [ "${script_name}" =  "d" ]; then
 		LINE=$(awk "{if (NR == $2) print \$0;}" $1)
 		RESOURCE=$(echo "$LINE" | cut -d '	' -f 2)
 		HOST=$(echo "$LINE" | cut -d '	' -f 3)