Hi

I do not log any bug for cp command. In our company, we copy huge Cobol files before processing data. This is to rollback our data files.

Suppose A1 is my huge file of 60GB and A1.bk is its backup file, before we process ( change ) data into A1. Then which of our method

would be faster?

1. Method-1 ( A1.bk exists )
    $ cp  A1 A1.bk

2. Method-2 
    $ rm -f A1.bk
    $ cp A1 A1.bk

3. Method-3
    $ cp --remove-destination A1 A1,bk

This operation is very simple. But our operators tell, in some cases cp takes longer time. How can we reduce copying time?

Thanks
Hemant Rumde
ING US
Boston US

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