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Full Discussion: Using NR with two variables at the beginning of awk
Top Forums Shell Programming and Scripting Using NR with two variables at the beginning of awk Post 302327319 by ramkrix on Saturday 20th of June 2009 08:56:15 PM
Old 06-20-2009
Error Using NR with two variables at the beginning of awk
hi My requirement is this:
I have a file having around 100000 records pipe delimited. Now I want to compare record 1 with record 2 and similarly record3 with record 4, this goes on.. For this purpose i put a script as follows:

#!bin/ksh

ct_line=1
nxt_line=`expr ${ct_line} + 1`

awk -F "|" -v i=${ct_line} -v j=${nxt_line} '{print i j} NR==i {
ct_dt=$1
ct_name=$2
}
NR==j {
nxt_dt=$1
nxt_name=$2
}
{print ct_dt nxt_dt}
i+=1
j=i+1
' <infile.txt >outfile.txt

Expected output:
1 2
20090501 20090502

Actual Output:
1 2
20090501

Its not all processing NR==j.. Why??

If there is any otehr way to do it in awk??
I mean, I need to read two lines at a time and assign their values to respective variables and compare..?/

Its an urgent requirement.. plz help
 

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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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