Solaris

"attr1","amv1;amv2;3","bmv1;bmv2","abc","abc1;abc2;abc3"

"attr1","amv","bmv1","abc","abc1"
"attr1","amv1","bmv1","abc","abc2"
"attr1","amv1","bmv1","abc","abc3"

"attr1","amv1","bmv2","abc","abc1"
"attr1","amv1","bmv2","abc","abc2"
"attr1","amv1","bmv2","abc","abc3" etc

i=0
awk 'BEGIN{RS=","}{print $1}' txt | sed 's/;/ /g' >> a.txt
while read str;do
	eval array${i}=$str
	let "i += 1"
done < a.txt

for a in $array0;do
	for b in $array1;do
		for c in $array2;do
			for d in $array3;do
				for e in $array4;do
					echo $a,$b,$c,$d,$e
				done
			done
		done
	done
done

#!/bin/awk -f
i=0
awk 'BEGIN{RS=",";FS="\n"}{print $1}' a.txt | sed 's/;/ /g' >> b.txt
while read str;do
    eval array${i}=$str
    i=`expr $i + 1`
    echo $i
done < b.txt
for a in $array0;do
        for b in $array1;do
                for c in $array2;do
                        for d in $array3;do
                                for e in $array4;do
                                        for f in $array5;do
                                        echo $a,$b,$c,$d,$e,$f
                                done
                        done
                done
          done
     done
done

awk -F, -v m=\" '{c2=split($2,col2,";");c3=split($3,col3,";");c5=split($5,col5,";")
for(i=0;++i<=c2;)
 for(j=0;++j<=c3;)
  for(k=0;++k<=c5;)
    print $1,col2[i] m,col3[j] m,$4,col5[k] m}' OFS="," infile

"attr1","amv","bmv1","abc","abc1"
"attr1","amv1","bmv1","abc","abc2"
"attr1","amv1","bmv1","abc","abc3"

"attr1","amv1","bmv2","abc","abc1"
"attr1","amv1","bmv2","abc","abc2"
"attr1","amv1","bmv2","abc","abc3"

"attr1","amv,av1","bmv1,bmv2","abc","abc1,abc2,abc3"