BEGIN{
lines="2,3,4,5"
num=split(lines,array,",")
for(i=1;i<=num;i++){
linechange[array[i]]
}
}
FNR in linechange{
$0="#" $0
}
1;
QkVHSU57CiAgbGluZXM9IjIsMyw0LDUiCiAgbnVtPXNwbGl0KGxpbmVzLGFycmF5LCIsIikKICBmb3IoaT0xO2k8PW51bTtpKyspewogICAgbGluZWNoYW5nZVthcnJheVtpXV0KICB9Cn0KRk5SIGluIGxpbmVjaGFuZ2V7CiAgJDA9IiMiICQwCn0KMTs=