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Full Discussion: Splitting a file based on first 8 chars
Top Forums UNIX for Dummies Questions & Answers Splitting a file based on first 8 chars Post 302399666 by paruthiveeran on Monday 1st of March 2010 07:16:02 AM
Old 03-01-2010
Splitting a file based on first 8 chars
I have an input file of this format
<Date><other data>

For example,
Code:
20081213aaaaaaaaa
20081213bbbbbbbbb
20081220ccccccccc
20081220ddddddddd
20081220eeeeeeeee
20081227ffffffffffffff

The first 8 chars are date in YYYYMMDD formT. I need to split this file into n files where n is the distinct number of dates in the input file and each output file should have the respective records based on the date.

In the above example, the file should split as

Output_file_20081213
Code:
20081213aaaaaaaaa
20081213bbbbbbbbb

Output_file_20081220
Code:
20081220ccccccccc
20081220ddddddddd
20081220eeeeeeeee

Output_file_20081227
Code:
20081227ffffffffffffff

Can anyone suggest a solution? The file is very huge. So, I do not wish to just read it multiple times and pass it through an if and redirect the output.

I am looking for something efficient with a single read and multiple redirects.
Last edited by zaxxon; 03-01-2010 at 08:22 AM.. Reason: use code tags please, ty
 

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LEARN ABOUT FREEBSD

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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