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Full Discussion: awk comparison and substitution
Top Forums Shell Programming and Scripting awk comparison and substitution Post 302573603 by waddle on Tuesday 15th of November 2011 05:07:47 AM
Old 11-15-2011
awk comparison and substitution
Hi,
here's my - not so easy to describe - problem: I want to compare the values of one file (FileA) with a cutoff-value and, if this comparison is true, substitute those values with those in the second file (FileB). However, there are many FileA's (FileA[1->200]), whereas there is only one FileB. Every FileA has three lines, each containing one value.
Code:
3.4
3.5
3.6

FileB has 3 columns and > 200 lines.
Code:
0.0154    0.0139    0.0227
0.0198    0.0259    0.0231
0.0126    0.0216    0.0174
0.0115    0.0145    0.0237
...            ...            ...

The three values of FileA1 should now be compared line-by-line with the cutoff-value. If true, the corresponding value of FileB should be assigned. However, those corresponding values are contained within a line of FileB. So I now need some kind of script which substitutes line x of FileA[1] (if value > or < cutoff) with the field in line[1] and cloumn x.
My script so far:
Code:
# getting number of line of FileB in which values of FileA are contained

n=`echo "$1" |sed 's/.*\([0-9]\{1,3\}\).*/\1/'`

# comparison and substitution

awk -v val=$n '{
    getline < "$1"
        for(i=1; i<=NF; i++){
            if($i >= 3.5){
                print $i 
            }
        else{
            getline < "FileB.txt"
            NR==n {print $i}
            }
        }
        } ' $1 FileB.txt > $1_new.txt

since i'm a beginner in awk, it's very intuituve aaaand - of course - doesn't work.

output should look something like this:
Code:
0.0154
3.5
3.6

Any help would be greatly appreciated!

waddle
 

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LEARN ABOUT REDHAT

igawk

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).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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