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Top Forums Programming Reading a particular line from a .txt file Post 302425799 by mugga on Sunday 30th of May 2010 09:55:55 AM
Old 05-30-2010
Data Reading a particular line from a .txt file

Hi,
I have a .txt file which contains the x, y and z co-ordinates of particles which I am trying to cast for a particular compound. The no. of particles present is of the order of 2 billion and hence the size of the text file is of the order of a few Gigabytes. The particles have been casted layer wise - thus, if there are 15000 layers in which I have casted the particles, there are approx. 2 billion/15000 particles in each layer. Thus, every 2 billion/15000 particles have the same Y co-ordinate. Now, I need to read the particles at a given value of Y (say y = 10). I wrote a small program, where I had used fin.seekg( ). However I realized that the seeking of the position from where the file has to be read is not done line-wise, but is done character-wise. Could someone please tell me how I could start seeking from a particular line in the file using a simple C++ program.
 

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BOMSTRIP(1)						    BSD General Commands Manual 					       BOMSTRIP(1)

NAME
bomstrip, bomstrip-files -- strip the BOM sequence from UTF-8 files SYNOPSIS
bomstrip bomstrip-files file ... DESCRIPTION
The bomstrip utility reads UTF-8 data from its standard input and copies it to its standard output, stripping the BOM (byte-order mark) from the beginning of the text if it is present. There are no command-line options and no parameters. The bomstrip-files utility removes the UTF-8 BOM from the specified files, saving each file's original contents with a .bom extension. It uses the bomstrip utility, trying to execute it as ``bomstrip''; if the bomstrip utility is installed under another name, or if a more com- plex command is desired, it may be supplied in the BOMSTRIP environment variable. EXAMPLES
Strip the BOM, if present, from a text file: bomstrip < bom.txt > nobom.txt Strip the BOM, if present, from all text files, backing them up with a .bom extension: bomstrip-files *.txt Use the OCAML implementation of bomstrip: env BOMSTRIP='ocaml bomstrip.ocaml' bomstrip-files *.txt SEE ALSO
The bomstrip home page: http://www.xs4all.nl/~mechiel/projects/bomstrip/ HISTORY
The bomstrip utility (in many languages) was written by Mechiel Lukkien, with implementations in various languages sent to him by others, including Andreas Gohr, Andrew Gerrand, Berteun Damman, Matthijs Bomhoff, Peter Pentchev, and Ruben Smelik. The bomstrip-files utility and this manual page were written by Peter Pentchev in the hope that they reflect the behavior of all the bomstrip implementations in all lan- guages. AUTHORS
Mechiel Lukkien <mechiel@xs4all.nl> Peter Pentchev <roam@ringlet.net> BSD
June 14, 2008 BSD
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