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Top Forums Shell Programming and Scripting Doubt in this trivial awk code Post 302513872 by kato on Thursday 14th of April 2011 08:55:42 AM
Old 04-14-2011
Quote:
Originally Posted by royalibrahim
Hi,

What is the difference in the following two awk one-liners?
Code:
awk -F, '{s[$2]++} END {if (s[$2] == 1 && $4 > "09:10:00") {print $2, $4}}' f1
awk -F, '{s[$2]++} s[$2] == 1 && $4 > "09:10:00" {print $2, $4}' f1

Even though, all the 2nd column values have duplicate records, the first code does not give any output whereas the second one gives some output. Could anyone please explain the process flow?
The 1st will count occurrences of $2 values but only print if $2 has occurred once and the final $4 is larger than "09:10:00".

The 2nd will also count occurrences of $2 values, but will print from each line if $2 has only occurred once so far and the current $4 is larger than "09:10:00".
 

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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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