Password Generator

passgen.sh

#!/bin/bash

chars="abcdefghijklmnopqrstuvwxyz"
consonants='bcdfghjklmnpqrstvwxyz'
vowels='aeiou'
digits='0123456789'
special='()`~!@#$*-+={}[]:;,. ?/'

length=16
include_uppercase=false
include_special=false
generate_memorable=false

__help() {
    cat << EOF
Usage: $(basename $0) [-n <length>] [-u] [-d] [-s] [-m] [-h]

Options:
  -n <length>      Set the length of the random string (default is 16)
  -u               Include uppercase letters in the random string
  -d               Include digits in the random string
  -s               Include special characters in the random string
  -m               Generate a memorable password
  -h               Show this help message and exit
EOF
    exit 0
}

__generate_random_password() {
    local length=${1:-12}
    local password=""
    local available_chars="$chars"

    for ((i=0; i<length; i++)); do
        password+=${available_chars:RANDOM%${#available_chars}:1}
    done

    echo "$password"
}

__generate_memorable_password() {
    local length=${1:-12}
    local password=""
    local available_consonants="$consonants"
    local available_vowels="$vowels"


    for ((i=0; i<length; i++)); do
        if (( i % 2 == 0 )); then
            password+=${available_consonants:RANDOM%${#available_consonants}:1}
        else
            password+=${available_vowels:RANDOM%${#available_vowels}:1}
        fi
    done

    echo "$password"
}

while getopts "n:udsmh" opt; do
    case $opt in
        n)
            length="$OPTARG"
            ;;
        u)
            include_uppercase=true
            ;;
        d)
            include_digits=true
            ;;
        s)
            include_special=true
            ;;
        m)
            generate_memorable=true
            ;;
        h)
            __help
            exit 0
            ;;
        *)
            __help
            exit 1
            ;;
    esac
done

if [ "$generate_memorable" = true ]; then
    res=$(__generate_memorable_password "$length")
else
    res=$(__generate_random_password "$length")
fi

function handle_special_chars() {
    local num_special_replacements=$((length * (15 + RANDOM % 16) / 100))
    if [ "$num_special_replacements" -eq 0 ]; then
        num_special_replacements=1
    fi

    for ((i=0; i<num_special_replacements; i++)); do
        local index=$((RANDOM % length))
        local random_special_char=${special:RANDOM%${#special}:1}
        res="${res:0:index}$random_special_char${res:index+1}"
    done
}

function handle_uppercase_chars() {
    local num_uppercase_replacements=$((length * (15 + RANDOM % 16) / 100))
    if [ "$num_uppercase_replacements" -eq 0 ]; then
        num_uppercase_replacements=1
    fi

    for ((i=0; i<num_uppercase_replacements; i++)); do
        local index=$((RANDOM % length))
        local random_uppercase_char=$(echo "$chars" | tr '[:lower:]' '[:upper:]' | cut -c $((RANDOM % 26 + 1)))
        res="${res:0:index}$random_uppercase_char${res:index+1}"
    done
}

function handle_digits() {
    local chance=1/10

    local num_digits_replacements=$((length * chance))
    if [ "$num_digits_replacements" -eq 0 ]; then
        num_digits_replacements=1
    fi

    for ((i=0; i<num_digits_replacements; i++)); do
        local index=$((RANDOM % length))
        local random_digit=${digits:RANDOM%${#digits}:1}
        res="${res:0:index}$random_digit${res:index+1}"
    done
}

if [ "$include_special" = true ]; then
    handle_special_chars
fi

if [ "$include_uppercase" = true ]; then
    handle_uppercase_chars
fi

if [ "$include_digits" = true ]; then
    handle_digits
fi

echo "$res"

Usage: passgen [-n <length>] [-u] [-d] [-s] [-m] [-h]

Options:
  -n <length>      Set the length of the random string (default is 16)
  -u               Include uppercase letters in the random string
  -d               Include digits in the random string
  -s               Include special characters in the random string
  -m               Generate a memorable password
  -h               Show this help message and exit

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