unix - combine two files -- one after another -

say, have 2 files: file1:

0 0 -3.44785 -2.15069 5.70183 17.8715 

and file2:

31.9812 50.5646 72.361 96.8705 119.893 144.409 

two combine them side side, use :

paste -d" " file1 file2 

or use awk command such thing.

if want combine these 2 files 1 after another, should write? know how using "cat". have tried different things modify "paste" command don't give desired output. please help? thanks.

normally use cat file1 file2, like:

awk '{print $0}' file1 file2 

or

awk '1' file1 file2 

(note: '1' the same thing print)