Readable hashes

#!/bin/bash

# The script generates readable hashes, for example, "opepurosog". It
# receives a path to a file as a positional parameter and outputs
# a sequence consisting of "vowel + consonat" combinations.

vowels=(a e i o u)
consonants=(b d f g h k l m n p r s t v z)

parity_flag=0
carry=0

# Getting the checksum; it consists of digits only
checksum=$(cksum $1 | cut -d " " -f 1)
checksum_length=${#checksum}
max_position_number=$((checksum_length - 1))
# Turning the checksum string into an array
array=($(echo $checksum | sed 's/./& /g'))

# Picking items from the array
for position_number in $(seq 0 $max_position_number); do
    # Identifying what type of position is dealt with: odd or even; if
    # the position is odd, a vowel is picked and vice versa
    parity_flag=$((position_number % 2))
    if test $parity_flag -eq 0; then
    position_contents=${array[position_number]}
    # As there are only 5 items in the "vowels" array and the
    # value of each checksum digit may range from 0 to 9, each
    # index value is divided by two
    vowel_array_index=$((position_contents / 2))
    # A vowel from the "vowel" array is picked and output to
    # stdout
    echo -n ${vowels[$vowel_array_index]}
    # The remainder is not wasted: it influences the choice of the
    # following consonant letter
    if test $position_contents -gt 4; then
        carry=$((position_contents - 4))
    fi
    else
    position_contents=${array[position_number]}
    # The remainder is added to an index used to pick a consonant
    consonant_array_index=$((position_contents + carry))
    echo -n ${consonants[$consonant_array_index]}
    carry=0
    fi
    parity_flag=0
done

# A newline is added
echo