$ cat bin/stats.gawk 
#!/usr/bin/gawk -f

{
	d = $1 ~ /^[0-9]/;
}

d && !f {
	M = $1;
	m = $1;
	f = 1;
}

d && $1 > M {
	M = $1;
}

d && $1 < m {
	m = $1;
}

d {
	c += 1;
	s += $1;
	ss += $1*$1;
}

END {
	OFS = "t";
	a = s/c;
	print "cnt,min,max,sum,avg,stdev:", c, m, M, s, a, sqrt(ss/c-a**2);
}

Ejemplo de uso:

$ ls -s1 | ./stats.gawk
cnt,min,max,sum,avg,stdev:	53	4	33064	78860	1487.92	6125.08