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Top Forums Shell Programming and Scripting Removing duplicate records in a file based on single column explanation Post 302608623 by cokedude on Sunday 18th of March 2012 05:51:38 AM
Old 03-18-2012
Quote:
Originally Posted by Scrutinizer
When NR==FNR , awk is reading the file for the first time and then it sets the counter. At the second pass (when NR > FNR) it prints only those records with a unique field 1. The command could be shortened to:
Code:
awk -F, 'NR==FNR{C[$1]++; next} C[$1]==1' infile infile

Why would there be errors reading the same file twice? After awk is done reading the file the first time it closes it and then reopens it.
Can you please elaborate on this? I still don't understand what is going on.

I didn't know that you could pass to 2 files to awk. What are some other purposes of passing 2 files to awk?
 

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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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