Shell Programming and Scripting

Dear all ,

Can any people explain this awk command?
What is the purpose of if (v[i,$i]++){b[$i]=$i;$i=""}?

awk -F, '{for (i=1;i<=NF;i++){if (v[i,$i]++){b[$i]=$i;$i=""}};print $0} END { print "dups are" ;for ( i in b) print i}' OFS="," input_file

This script is used to replace column duplicate value

FROM
=====
1,2,3,4,5
a,b,c,d,e
b,c,a,e,f
a,b,e,a,h

TO
==
a,b,c,d,e
b,c,a,e,f
,,e,a,h
dups are
a
b

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