csplit - split by content of field

[Assaf Gordon]

Hello,

Attach is a patch that gives 'csplit' the ability to split files by content of 
a field.
A typical usage is:

    ## the "@1" pattern means "start a new file when field 1 changes"
    $ printf "A\nA\nB\nB\nB\nC\n" | csplit - @1 {*}
    $ wc -l xx*
    2 xx00
    3 xx01
    1 xx02
    6 total
    $ head xx*
    ==> xx00 <==
    A
    A
    
    ==> xx01 <==
    B
    B
    B
    
    ==> xx02 <==
    C



This is just a proof of concept, and the pattern specification can be changed 
(I think "@N" doesn't conflict with any existing pattern).

The same can probably be achieved using other programs (awk comes to mind), but 
it won't be as simple and clean (with all of csplit's output features).

Let me know if you're willing to consider such addition.

Thanks,
 -gordon

0001-csplit-split-files-by-field-change.patch
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