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Full Discussion: Delete duplicated fields in a line
Top Forums Shell Programming and Scripting Delete duplicated fields in a line Post 302893133 by Scrutinizer on Monday 17th of March 2014 01:52:39 PM
Old 03-17-2014
Quote:
Originally Posted by Gr4wk
Thanks Scrutinizer.. it works!

Can you explain what is the meaning of the code?
Sure:
Code:
awk '
{                              # For every line in file "file"
  for(i=1; i<NF; i++)          # Iterate variable "i" over the number of fields-1
    for(j=i+1; j<=NF; j++)     # Do the same for variable j from i+1 to the number of fields
      if($i==$j) $i=$j=x       # If two of these fields are equal then make their values ""
  $0=$0                        # Recalculate the fields, if previously fields were made equal to "" 
                                    #then there are now fewer fields..
  $1=$1                        # Recalculate the record, so that any amount of spacing between fields 
                                    # is converted to the OFS which is a single space.  
}
1                              # Print the record
' file                         # Read the file "file"

Hope this helps..
Last edited by Scrutinizer; 03-17-2014 at 07:58 PM..
These 2 Users Gave Thanks to Scrutinizer For This Post:
Gr4wk jim mcnamara
 

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LEARN ABOUT MINIX

ppmtopgm

ppmtopgm(1)                                                   General Commands Manual                                                  ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and  pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

                                                                   10 April 2000                                                       ppmtopgm(1)
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