Grass4.1 installation

[Chang-Chou Chiang]

Keywords: locks
Hi, 

I am installing Grass4.1 (linux version) into my PC.
I have some problems when I am running grass.

I  can run d.mon. But, when I tried to run d.rast, I got 
  No graphics monitor has been selected for output. 
  Please run "d.mon" to select a graphics monitor. 

When I run d.mon select=x0,  I got
  Error- 
Could not complete locking process for monitor <x0>. 
Lock file is /usr/grass/lockc/Mama/mon.116512

What does it mean?
Where Mama stands for my PC domain. 
Do I need to create a directory, Mama, under locks?
How do I get the file mon.116512?

Thanks for help


C.C. Chiang
Farmlab  
University of Illinois at Urbana-Champaign
E-mail: chiang at farml1.agecon.uiuc.edu