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output difference in two files

 
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Old 07-13-2008
output difference in two files
Hi,

Please help me, I have two files. I need to output the difference of contents of each file in another file. For example, I need to know the content of the file1 that does not exist on file2 and vice versa. Please take note that the size of the files are large. How can I do it using unix command or a unix script? Thanks in advance!

HTML Code:
file1:
21399,60459
21389,60589
21365,60298
21397,60287
21377,60812

file2:
21365,60298
21320,60100
21389,60589
21308,60611
21321,60432

output:
file1                       file2
21320,60100           21399,60459
21308,60611           21397,60287
21321,60432           21377,60812
 
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LEARN ABOUT MINIX

pnmpsnr

pnmpsnr(1)                                                    General Commands Manual                                                   pnmpsnr(1)

NAME

       pnmpsnr - compute the difference between two portable anymaps

SYNOPSIS

       pnmpsnr [pnmfile1] [pnmfile2]

DESCRIPTION

       Reads  two  PBM,  PGM, or PPM files, or PAM equivalents, as input.  Prints the peak signal-to-noise ratio (PSNR) difference between the two
       images.  This metric is typically used in image compression papers to rate the distortion between original and decoded image.

       If the inputs are PBM or PGM, pnmpsnr prints the PSNR of the luminance only.  Otherwise, it prints the separate PSNRs of the luminance, and
       chrominance (Cb and Cr) components of the colors.

       The  PSNR  of  a  given component is the ratio of the mean square difference of the component for the two images to the maximum mean square
       difference that can exist betwee any two images.  It is expressed as a decibel value.

       The mean square difference of a component for two images is the mean square difference of the component value, comparing  each  pixel  with
       the pixel in the same position of the other image.  For the purposes of this computation, components are normalized to the scale [0..1].

       The maximum mean square difference is identically 1.

       So the higher the PSNR, the closer the images are.  A luminance PSNR of 20 means the mean square difference of the luminances of the pixels
       is 100 times less than the maximum possible difference, i.e. 0.01.

SEE ALSO

       pnm(5)

                                                                   04 March 2001                                                        pnmpsnr(1)