On Jul 24, 2009, at 12:00 PM, Joe wrote:

> Hey all,
>
> I have a user with a huge mailbox that is borking things up here. I  
> was
> going to drop all mail older than the 19th to reduce the filesize. I  
> had
> planned to do this by opening it in vim, finding the first line with
> "Jul 18" and remove from the line before it to line 0. Problem is,  
> it's
> a 160+ MB file and vim doesn't handle that too well. I know which line
> number I want to delete to though. So here's the question....
>
> How can I remove from line 0 to line 1000000 (as an example) from the
> file? Or, how can I export from line 1000001 to the end in a new file
> (which I could then replace the current mailbox file with)? I have no
> idea how to accomplish either.
>
> Thanks in advance for any help!
>
> -Joe


Try split.  'man split'  It will break 1 file into many, and you can  
give it criteria like 'split after X lines'...