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Subject: Re: Splitting a file from specific column content
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From: Roy Smith <roy@panix.com>
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Date: Sun, 22 Jan 2012 14:26:29 -0500
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19228

I stand humbled.

On Jan 22, 2012, at 2:25 PM, Tim Chase wrote:

> On 01/22/12 08:45, Roy Smith wrote:
>> I would do this with standard unix tools:
>>=20
>> grep '^[012]' input.txt>  first-three-seconds.txt
>> grep '^[34]' input.txt>  next-two-seconds.txt
>> grep '^[567]' input.txt>  next-three-seconds.txt
>>=20
>> Sure, it makes three passes over the data, but for 20 MB of data, you
>> could have the whole job done in less time than it took me to type =
this.
>=20
>=20
> If you wanted to do it in one pass using standard unix tools, you can =
use:
>=20
> sed -n -e'/^[0-2]/w first-three.txt' -e'/^[34]/w next-two.txt' =
-e'/^[5-7]/w next-three.txt'
>=20
> -tkc
>=20
>=20
>=20


--
Roy Smith
roy@panix.com