compare 2 file and print difference in the third file URG PLS

Shell Programming and Scripting
1

Hi
I have two files in unix. I need to compare two files and print the differed lines in other file

Eg
file1
1111
2222
3333
file2
1111
2222
3333
4444
5555

newfile
4444
5555

Thanks In advance

2 
comm -3 file1 file2>newfile
3

if I do this then extra space is getting added at begining of each line in new file

4 
printf "%s\n" $(comm -3 file1 file2)>newfile

If the words/lines contain spaces:

rm newfile&&comm -3 file1 file2|while read;do printf "%s\n" "$REPLY">>newfile;done