Linux command: 
 cp a tmp.txt
 vi tmp.txt
 
vi command:
 (cursor at 1 line before begining of where we want to copy) d1G
 (cursor at 1 line after end of where we want to copy) dG
 :x 
 
Now tmp.txt contains only the part we want.
 
Linux command:
 vi b
 (cursor at where we want to paste) :r tmp.txt
 
  
有點笨的作法, 但google了一下, 我只會這個....
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    bamil

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