{ print }
{ print NR, NF, $0 }
{ $2 = length($2); print }
{ s += length($2) }
END { print s }
{ s += $3 }
END { print s }
{ for (i = NF; i > 0; i--)
	printf "%s ", $i
  printf("\n")
}
	$1 == $1 && $2 == $2	# test some string compares
	$1 != $2
{
	sss = ""
	for (i = NF; i > 0; i--)
		sss = sss " " $i
	print sss
}
{
	xx[$1] += length
}
END {
	for (i in xx)
		print i, xx[i] | "sort"
}
NF % 2 == 0
length % 2 == 0
! /^./
/.$/
BEGIN { xxx = ".$" }
$0 ~ xxx
{ print substr($0, 10,10) }
{ $3 = "xxx" $3 "xxx"; $4--; print }
{ for (i = 1; i <= NF; i++)
	x[i] = $i
  for (i = 1; i <= NF; i++)
	print x[i]
}
{ for (i = 1; i <= NF; i++)
	y[i] = $i
  for (i = 1; i <= NF; i++)
	printf "%d %s\n", i, y[i]
}
function abs(x) { return (x < 0) ? -x : x }
BEGIN {	n = 1000
	for (i = 1; i < n; i++) x[i] = rand()
	for (i in x)
		for (j in x)
			if (abs(x[i]-x[j]) < .01) break
      }