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Top Forums Shell Programming and Scripting awk count characters, sum, and divide by another column Post 302429537 by peromhc on Monday 14th of June 2010 06:40:42 PM
Old 06-14-2010
CPU & Memory awk count characters, sum, and divide by another column

Hi All,

I am another biologist attempting to parse a large txt file containing several million lines like:

tucosnp 56762 T Y 228 228 60 23 .CcCcc,,..c.c,cc,,.C...

What I need to do is get the frequency of periods (.) plus commas (,) in column 9, and populate this number into another column. Incidentally, column 8 is count of all characters in column 9.

So in the example, the correct number to populate the new column is .57 (10/23=.57). There are 10 periods and commas

I know that I must be able to do this somehow with awk, and have the simplest part of the solution, but I can't figure out how to code the denominator "count of . + , in column 9".

Code:
awk '{print $1,$2,$3,$4,$8,length($8)/"count of . + , in column 9"}' in > out

My outfile will look something like:

tucosnp 56762 T Y 23 .57

Thanks for any help!
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgawk | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for gawk is available on http://opensolaris.org. Free Software Foundation Nov 3 1999 IGAWK(1)
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