sort file1 > file1.sorted
sort file2 | join -1 10 -2 1 file1.sorted - | tee file3

##</code><code>##

$ echo "SimpsonH","Homer","Simpson","NULL","648","0","218 555","Nuclear Control","Nuclear Operator","111" > file1
$ echo "111","BurnsM" > file2
$ join -t, -1 10 -2 1 file1 file2
111,SimpsonH,Homer,Simpson,NULL,648,0,218 555,Nuclear Control,Nuclear Operator,BurnsM