Awk scripts for total/average/max/min. All numbers come in on STDIN

avg.awk

#!/usr/bin/awk -f
BEGIN	{ TOTAL=0 }
	{ TOTAL = TOTAL + $1 }
END	{ print TOTAL/NR }

max.awk

#!/usr/bin/awk -f
	{ if( MAX == "" || $1+0 > MAX ) { MAX=$1+0 } }
END	{ print MAX }

min.awk

#!/usr/bin/awk -f
	{ if( MIN == "" || $1+0 < MIN ) { MIN=$1+0 } }
END	{ print MIN }

total.awk

#!/usr/bin/awk -f
BEGIN	{ TOTAL=0 }
	{ TOTAL = TOTAL + $1 }
END	{ print TOTAL }