---
0a1
1,2d0
2c2
< It only exists under dira.
< It will be changed.
< This is onlya.txt
> It will be modified.
> This is onlyb.txt.
dif.exe /r /e dira\dir1\onlya.txt dirb\dir1\onlya.txt
dif.exe /r /e dira\dir2\onlyb.txt dirb\dir2\onlyb.txt
dif.exe /r /e dira\mod.txt dirb\mod.txt
