graph.sh

#!/bin/bash

usage() {
  echo 'usage: ./graph.sh --file [PathToFile]'
}

while [[ ${#} -gt 0 ]]; do
  opt="${1}"
  shift
  value="${1}"
  if [[ "${value}" =~ ^-{1,2}.* ]]; then
    echo "Error: Argument is blank."
    exit 1
  fi
  case "${opt}" in
    "-f"|"--file" )
      file="${1}"
      shift
    ;;
    * )
      echo "ERROR: Invalid option: \""${opt}"\"" >&2
      exit 1
    ;;
  esac
done

if [[ -z "${file}" ]]; then
  usage
  exit 1
fi

max_value=`cat ${file} | awk '{print $2}' | sort -nr | head -n 1`
min_value=`cat ${file} | awk '{print $2}' | sort -n | head -n 1`
one_block=$((max_value / min_value))
max_length_item=`cat ${file} | awk '{print length($1)}' | sort -nr | head -n 1`

while read line; do
  item=`echo ${line} | awk '{print $1}'`
  value=`echo ${line} | awk '{print $2}'`
  block_sum=$((value / min_value))

  printf "%-${max_length_item}s%-2s" "${item}"
  for block in `seq ${block_sum}`; do
    echo -n "▇"
  done
  echo " ${value}"
done < ${file}