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Top Forums Shell Programming and Scripting awk script: print line number n of another file Post 302402628 by kpg on Wednesday 10th of March 2010 08:24:14 AM
Old 03-10-2010
Thank you for your reply. I'll try to explain what I want to do:

fileA is:
000000011111000
000000329100001
000000330100001

the contents indicate line numbers (position 0 to 8) to look for in fileB
fileB is:
dataline1
dataline2
...
dataline32
dataline33
...


Now the output of my awk should be for each line in fileA
  • prettyfied line from fileA. eg print "error on line" line_num
  • prettyfied matching line (dataline line_num in fileb)

I just do not understand how to modify your code to achieve this.Smilie
Code:
1 gawk '
2 BEGIN{} 
3 NR==FNR{
4   line_num=int( substr($0,1,9) ) ; 
5   a[line_num] ;
6   next}
7  (FNR in a)
8 ' fileA fileB

at line 2 i can insert my initialization stuff.
#3. builds the array?
#4 sets the line_num variable;
#5 no idea what this does
#6 a search said "next means nothing else is done with this line from the first file"
#7 no idea

Maybe you can answer my questions,please?
Is it possible to let awk print a mixed output from fileA and matching lines in fileB

Thank you very much!
 

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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). Free Software Foundation Nov 3 1999 IGAWK(1)
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