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Today's Topics:
1. Re: merge two files in to one file (Erik de Castro Lopo)
2. Re: merge two files in to one file (kolli kolli)
3. Re: merge two files in to one file (kolli kolli)
4. Re: merge two files in to one file (Erik de Castro Lopo)
5. Re: merge two files in to one file (kolli kolli)
----------------------------------------------------------------------
Message: 1
Date: Wed, 5 Oct 2011 12:24:57 +1100
From: Erik de Castro Lopo <mle...@mega-nerd.com>
Subject: Re: [Haskell-beginners] merge two files in to one file
To: beginners@haskell.org
Message-ID: <20111005122457.6b7f363644abd03d16aaf...@mega-nerd.com>
Content-Type: text/plain; charset=US-ASCII
kolli kolli wrote:
> all the lines of first file followed by all the lines of second file
Well, it can be as simple as:
main :: IO ()
main = do
data1 <- readFile "firstfile"
data2 <- readFile "secondfile"
writeFile "output" (data1 ++ data2)
which should work fine for text files of arbitrary length. It won't
however work for binary files (due to text encoding issues). For that
try something like:
import qualified Data.ByteString.Lazy as BSL
main :: IO ()
main = do
data1 <- BSL.readFile "firstfile"
data2 <- BSL.readFile "secondfile"
BSL.writeFile "output" (BSL.concat [data1, data2])
In both cases, Haskell's lazy evaluation means that the program does
not need to read in the whole of each file, but will read both files
in chunks as well as writing the output file in chunks.
HTH,
Erik
--
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/
------------------------------
Message: 2
Date: Tue, 4 Oct 2011 19:27:56 -0600
From: kolli kolli <nammukoll...@gmail.com>
Subject: Re: [Haskell-beginners] merge two files in to one file
To: beginners@haskell.org
Message-ID:
<CAE7D9k46Hd-Pk=1inTiL9O=ud8wfox7yj9qlqqtjyp4vxbf...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
thanks a lot...
On Tue, Oct 4, 2011 at 7:24 PM, Erik de Castro Lopo <mle...@mega-nerd.com>wrote:
> kolli kolli wrote:
>
> > all the lines of first file followed by all the lines of second file
>
> Well, it can be as simple as:
>
> main :: IO ()
> main = do
> data1 <- readFile "firstfile"
> data2 <- readFile "secondfile"
> writeFile "output" (data1 ++ data2)
>
> which should work fine for text files of arbitrary length. It won't
> however work for binary files (due to text encoding issues). For that
> try something like:
>
> import qualified Data.ByteString.Lazy as BSL
>
> main :: IO ()
> main = do
> data1 <- BSL.readFile "firstfile"
> data2 <- BSL.readFile "secondfile"
> BSL.writeFile "output" (BSL.concat [data1, data2])
>
> In both cases, Haskell's lazy evaluation means that the program does
> not need to read in the whole of each file, but will read both files
> in chunks as well as writing the output file in chunks.
>
> HTH,
> Erik
> --
> ----------------------------------------------------------------------
> Erik de Castro Lopo
> http://www.mega-nerd.com/
>
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Message: 3
Date: Tue, 4 Oct 2011 20:10:33 -0600
From: kolli kolli <nammukoll...@gmail.com>
Subject: Re: [Haskell-beginners] merge two files in to one file
To: beginners@haskell.org
Message-ID:
<CAE7D9k7u8jLe0y-4YvMw=0ctb+huvg6o-w8njkf-ovmjata...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I think this(merging two files) is same as concatenating two files..
On Tue, Oct 4, 2011 at 7:24 PM, Erik de Castro Lopo <mle...@mega-nerd.com>wrote:
> kolli kolli wrote:
>
> > all the lines of first file followed by all the lines of second file
>
> Well, it can be as simple as:
>
> main :: IO ()
> main = do
> data1 <- readFile "firstfile"
> data2 <- reFile "secondfile"
> writeFile "output" (data1 ++ data2)
>
> which should work fine for text files of arbitrary length. It won't
> however work for binary files (due to text encoding issues). For that
> try something like:
>
> import qualified Data.ByteString.Lazy as BSL
>
> main :: IO ()
> main = do
> data1 <- BSL.readFile "firstfile"
> data2 <- BSL.readFile "secondfile"
> BSL.writeFile "output" (BSL.concat [data1, data2])
>
> In both cases, Haskell's lazy evaluation means that the program does
> not need to read in the whole of each file, but will read both files
> in chunks as well as writing the output file in chunks.
>
> HTH,
> Erik
> --
> ----------------------------------------------------------------------
> Erik de Castro Lopo
> http://www.mega-nerd.com/
>
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Message: 4
Date: Wed, 5 Oct 2011 13:20:16 +1100
From: Erik de Castro Lopo <mle...@mega-nerd.com>
Subject: Re: [Haskell-beginners] merge two files in to one file
To: beginners@haskell.org
Message-ID: <20111005132016.b87d162de5142b393039b...@mega-nerd.com>
Content-Type: text/plain; charset=US-ASCII
kolli kolli wrote:
> I think this(merging two files) is same as concatenating two files..
Yes, what we are doing is concatenation. I would not call this merging
at all.
Erik
--
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/
------------------------------
Message: 5
Date: Tue, 4 Oct 2011 21:08:07 -0600
From: kolli kolli <nammukoll...@gmail.com>
Subject: Re: [Haskell-beginners] merge two files in to one file
To: beginners@haskell.org
Message-ID:
<CAE7D9k7kBD2LBJzctb9=EME4m5eU8w9=cpwhjkogj0ptpiu...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
how to sort the values according to column or by date or by time or by
alphabetical order
* 3616 * 3556 2 11:49:43 /usr/bin/ps
*3332* 2676 1 Jul 18 /usr/bin/bash
*500* 2832 0 Jul 18 /usr/bin/bash
On Tue, Oct 4, 2011 at 8:20 PM, Erik de Castro Lopo <mle...@mega-nerd.com>wrote:
> kolli kolli wrote:
>
> > I think this(merging two files) is same as concatenating two files..
>
> Yes, what we are doing is concatenation. I would not call this merging
> at all.
>
> Erik
> --
> ----------------------------------------------------------------------
> Erik de Castro Lopo
> http://www.mega-nerd.com/
>
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://www.haskell.org/mailman/listinfo/beginners
>
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