Shell Programming and Scripting

prd-1234 yes no yes yes
prd-2345 no no no yes
prd-6475 yes yes yes no

prd-1234 no no no yes
prd-2345 yes no no no

prd-1234 1 3
prd-235 1 4

awk '
        NR == FNR {
                A[$1] = $0
                next
        }
        $1 in A {
                split ( A[$1], V )
                for ( i = 2; i <= NF; i++ )
                {
                        if ( $i != V[i] )
                                s = s ? s OFS i - 1 : i - 1
                }
                print $1, s
                s = ""
        }
' file1 file2

awk -F, '

join a b | awk '{
 n=(NF-1)/2
 printf $1
 for(i=1;i<=n;i++)
  if($(i+1) != $(i+1+n))
   printf(" %s", i)
 print ""
}'