Shell Programming and Scripting

echo "a,b,d,f,g 21212,sfsd,4546,67867,a,asda,b" | awk  'function get_diff(x,y) {
	n=split(x,P,",");
	m=split(y,K,",");
	for(i=1;i<=n;i++){
	for(j=1;j<=m;j++){
	if(P[i] == K[j]){delete P[i]}}}
	for(i=1;i<=n;i++){if(P[i]){s=s?s","P[i]:P[i]}}
	print s
}
{
get_diff($1,$2)}'

echo -e "a,b,d,f,g\n21212,sfsd,4546,67867,a,asda,b"|
awk -F, 'NR==1 {for (i=1;i<=NF;i++) Arr[$i]++}
         NR==2 {for (i=1;i<=NF;i++) delete Arr[$i]}
         END {for (i in Arr) OP=OP?OP","i:i; print OP}'