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Full Discussion: Remove interspersed headers in .dat file with AWK
Top Forums Shell Programming and Scripting Remove interspersed headers in .dat file with AWK Post 302545976 by gd9629 on Wednesday 10th of August 2011 05:41:26 AM
Old 08-10-2011
Remove interspersed headers in .dat file with AWK
Heya there,

A small selection of my data is shown below.

Code:
DATE                      TIME                      FRAC_DAYS_SINCE_JAN1      
2011-06-25                08:03:20.000              175.33564815 
2011-06-25                08:03:25.000              175.33570602
2011-06-25                08:03:30.000              175.33576389 
2011-06-25                08:03:35.000              175.33582176

There are a lot more headers and about 20 days worth of data in this one file. The problem I have is that this .dat file has been concatenated from many individual files, for which I used the following code.

Code:
find /u/gd9629/private/Scripts/Gavin/picarro -type f -name "CF*nc.dat" -exec cat {} > /u/gd9629/private/Scripts/Gavin/Data/june2011.dat \;

This also concatenates all the headers which are at the top of each individual file. Is there a way to remove all the interspersed headers throughout my combined .dat file?

Thanks
 

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LEARN ABOUT OSX

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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