gistfile1.txt

variable "allow_egress_all_ids" {
  default = {
    sg1 = "${aws_security_group.sg1.id}"
    sg2 = "${aws_security_group.sg2.id}"
    sg3 = "${aws_security_group.sg3.id}"
    sg4 = "${aws_security_group.sg4.id}"
  }
}

resource "aws_security_group_rule" "allow_egress_all" {
  count = "${length(var.allow_egress_all_ids)}"
  type = "egress"
  from_port = 0
  to_port = 0
  protocol = "-1"
  cidr_blocks = ["0.0.0.0/0"]
  security_group_id = "${lookup(var.allow_egress_all_ids, count.index)}"
}