buckets.zsh

#!/usr/bin/env zsh

numbers=($(<${1}))
results=()

# getting 0-10, ..., 90-99
for i in {0..9}; do
  lower=$(( ${i} * 10 ))
  upper=$(( ${lower} + 9 ))

  count=0
  for n in ${numbers}; do
    if [[ ${n} -ge ${lower} ]] && [[ ${n} -le ${upper} ]]; then
      count=$(( count + 1 ))
    fi
  done

  # add to final array
  results+=(${count})
done

# print in the required format
printf "%s" ${results}
print