How to set ignored pattern in ediff in emacs

[gan_xiao_jun]

Hello,

I think emacs's ediff is a very powerful tool. :-)

But I am not sure if there a method to set ignored
pattern in ediff, 
just like 
diff -u file1 file2 -I "macro=[0-9]" 
do

I have another small question:
Is there a way to specify file1 and file2 in command
line when launch emacs, else I have to input the long
filenames in emacs. 

Thanks in advance
gan


                
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