Output different/identical rows in two files

Http://blog.csdn.net/wzhwho/article/details/6169603

[Root @ bb-sns-nac-test02 ~] # Cat f1.txt
Aaa
Bbb
CCC
Ddd
Eee
Fff
[Root @ bb-sns-nac-test02 ~] # Cat f2.txt
Ddd
Eee
Fff
Ggg
Hhh
Retrieve the same row: 
[Root @ bb-sns-nac-test02 ~] # Grep-WF f1.txt f2.txt
Ddd
Eee
Fff

[Root @ bb-sns-nac-test02 ~] # Grep-fxf f1.txt f2.txt
Ddd
Eee
Fff

Retrieve different rows:

[Root @ bb-sns-nac-test02 ~] # Grep-fvxf <(grep-fxf f1.txt f2.txt) f1.txt f2.txt
F1.txt: AAA
F1.txt: bbb
F1.txt: CCC
F2.txt: ggg
F2.txt: hhh
F2.txt:

[Root @ bb-sns-nac-test02 ~] # Grep-WVF f1.txt f2.txt
Ggg
Hhh

[Root @ bb-sns-nac-test02 ~] # Grep-WVF f2.txt f1.txt
Aaa
Bbb
CCC