probe begin
{
	a = "foo"
	str = "abcfoobad"

	if (isinstr(str,a))
		printf("\"%s\" is in \"%s\"\n", a, str)
	else
		printf("\"%s\" is NOT in \"%s\"\n", a, str)

	str = "abcdefg"
	if (isinstr(str,a))
		printf("\"%s\" is in \"%s\"\n", a, str)
	else
		printf("\"%s\" is NOT in \"%s\"\n", a, str)

	a = ""
	str = ""
	if (isinstr(str,a))
		printf("\"%s\" is in \"%s\"\n", a, str)
	else
		printf("\"%s\" is NOT in \"%s\"\n", a, str)

        exit()
}