Move first in to OpenFOAM directory

cd $WRKDIR/OpenFOAM/$USER-1.7.1/run

Copy the directory of the cavity flow tutorial input files in to the  run directory

cp -r $FOAM_TUTORIALS/incompressible/icoFoam/cavity .

and move in to the case directory

cd cavity

Create the mesh by giving the command

blockMesh

and run the solution

icoFoam

The results are created in to the directories named as 0.*, and can be post processed for example with paraFoam (OpenFOAM version of paraView).