[GRASS-user] how to draw line with arrow mark to line top (tip)

[sgw00412 at nifty.com]

Hollow grass users

I'm from Japan, and biggner.

I do not find how to draw line with arrow mark to line top (tip).

for exsample...

normally line;
--------

line with arrow mark to line top (tip);
-------->
or
<--------

I read online manual and tried to command 'd.vect layer_name icon=basic/arrow1
', however nothing happend....

Does anyone to know it?

Best
Yasuo SHIMADA (japan weather associaton)