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Full Discussion: Awk: count unique elements in a field and sum their occurence across the entire file
Top Forums UNIX for Beginners Questions & Answers Awk: count unique elements in a field and sum their occurence across the entire file Post 303016007 by beca123456 on Wednesday 18th of April 2018 06:06:45 AM
Old 04-18-2018
Awk: count unique elements in a field and sum their occurence across the entire file
Hi,

Sure it's an easy one, but it drives me insane.

input ("|" separated):
Code:
1|A,B,C,A
2|A,D,D
3|A,B,B

I would like to count the occurence of each capital letters in $2 across the entire file, knowing that duplicates in each record count as 1.
I am trying to get this output (tab-separated; does not matter if sorted or not by $1):
Code:
A   3
B   2
C   1
D   1


What I tried so far:
Code:
gawk '
BEGIN{FS="|";OFS="\t"}
{
   a=split($2,b,",")
   for(i=1;i<=a;i++){
      if(count[b[i]]++==0){
         total[b[i]]++
      }
   }
}
END{
   for(k in total){
      print k "\t" total[k]
   }
}


But I get:
Code:
A   1
B   1
C   1
D   1

There is a conflict between the array 'count' (to count the letter only once per field per record) and the array 'total' (to sum up the number of letter in the file).
 

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LEARN ABOUT REDHAT

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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