gistfile1.txt

# Bucketize stdin to nearest multiple of argv[1], or 10 if no args given.
# "nearest" means 0..4.999 -> 0, 5..14.999 -> 10, etc.

# Usage:
# while true ; do echo $[ 1 + $[ RANDOM % 100 ]]; done | head -99 | bucket.sh 8

awk -v multiple="${1:-10}" '

function bucketize(a) {
  # Round to the nearest multiple of "multiple"
  #  (nearest... i.e. may round up or down)
  return int((a + (multiple/2)) / multiple) * multiple;
}

# All lines get bucketized.
{ arr[bucketize($1)]++ }

# When done, output the array.
END {
  for (i in arr) {
    print i, arr[i]
  }
}
' | sort -k2n,2 -k1n,1