Now reposition yourself into the directory DDA\ (e.g., type cd ..), and copy the executable from src/ddscat to the DDA directory by typing
cp src/ddscat ddscat
This should copy the file DDA/src/ddscat to DDA/ddscat . Similarly, copy the sample parameter file ddscat.par and the file diel.tab to the DDA directory by typing
cp doc/ddscat.par ddscat.par cp doc/diel.tab diel.tab