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Full Discussion: Deciphering AWK code
Top Forums UNIX for Beginners Questions & Answers Deciphering AWK code Post 303041579 by arsalane on Thursday 28th of November 2019 05:24:54 AM
Old 11-28-2019
Deciphering AWK code

Dear experts,
I am a relative novice in the Unix and came across a very useful code that I regularly use for my research blindly. I am wondering if any of the professional members could kindly briefly explain to me what the code actually does?

Many thanks in advance

The script is

Code:
awk '!(a[$1]) {a[$1]=$0; next} a[$1] {w=$1; $1=""; a[w]=a[w] $0} END {for (i in a) print a[i]}' FS="\t" OFS="\t" A.txt

The original title is : Find duplicates in column 1 and merge their lines (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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