08-07-2011
Combining two single column files side-by-side
Hi,
I am looking for a sed/awk script to join two large (~300 M) single column files (one is sorted and the other is not sorted) side-by-side. I have a shell script but its taking ages to do the task so looking for an optimized fast solution.
The two files look like:
File1 (sorted)
a1
a2
a3
a4
File2 (unsorted)
b1
b2
b3
b4
Desired output:
a1 b1
a2 b2
a3 b3
a4 b4
PS: the two input file are massive.
Cheers,
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LEARN ABOUT DEBIAN
stereo3d
STEREO3D(1) General Commands Manual STEREO3D(1)
NAME
stereo3d - render a Raster3D scene as a side-by-side stereo pair
SYNOPSIS
stereo3d [options] [-png [outfile.png ]] < infile.r3d > outfile.png
stereo3d [options] -tiff [outfile.tiff] < infile.r3d > outfile.tiff
stereo3d is a shell script that renders a single Raster3D input file as a side-by-side stereo pair.
stereo3d uses the Raster3D utilities normal3d and render, and the ImageMagick image processing package. Intermediate scratch files are
created in directory TMPDIR, if defined, otherwise in /usr/tmp.
The right eye and left eye views are separately rendered, optionally given black borders, and merged to form a single side-by-side stereo
pair.
Input is from stdin, output is to stdout unless a filename is given as an argument to the -png or -tiff options.
EXAMPLES
If the following line would render a single image:
render -tiff single.tiff < input.r3d
then the following line would render the same scene as a stereo pair instead:
stereo3d -tiff stereo.tiff < input.r3d
OPTIONS
The options below are specific to stereo3d. All other options, e.g. -labels or -gamma 1.2 are passed through to the render program.
-angsep
By default the stereo effect is generated by a shear operation. The -angsep option creates stereo by using angular separation instead.
Neither option is perfect: the default handles shadows badly, and the -angsep option blurs specular highlights.
-border
By default the left and right images are placed next to each other with no intervening space and no frame around them. The -border option
requests a 4 pixel wide black border separating and surrounding the component images.
SOURCE
web URL:
http://www.bmsc.washington.edu/raster3d/raster3d.html
contact:
Ethan A Merritt
University of Washington, Seattle WA 98195
merritt@u.washington.edu
SEE ALSO
normal3d(l), render(l), raster3d(l)
AUTHORS
Ethan A Merritt.
Raster3D 19 Dec 2010 STEREO3D(1)