MiniUnix/usr/source/rat/run

Find at most related files.
including files from this version of Unix. 
yacc r.g
cc -s -O r1.c r2.c lex.c -ly -lp -lp
cmp a.out /usr/lib/ratfor
cp a.out /usr/lib/ratfor
rm *.o a.out y.tab.c