pass

#!/bin/bash

#region Constantes
UPPER="A-Z"
LOWER="a-z"
NUMBERS="0-9"
SYMBOLS="!@#$%&*()?{}[]:;|_='\-"

CLR_ROJO="\e[91m"
CLR_FIN="\e[m"
#endregion

_error() {
    echo -e "${CLR_ROJO}$(basename "$0"): $1${CLR_FIN}" >&2
}

main() {
    local caracteres=$(procesar_argumentos $@)
    if [ -z "$caracteres" ]; then
        return 1
    fi
    generar_contraseñas "$caracteres"
}

procesar_argumentos() {
    if [ "$1" ]; then
        local an=
        while [ "$1" ]; do
            case "$1" in
                -an) echo -n "$NUMBERS$UPPER$LOWER" ;;
                -may) echo -n "$UPPER" ;;
                -min) echo -n "$LOWER" ;;
                -num) echo -n "$NUMBERS" ;;
                -sym) echo -n "$SYMBOLS" ;;
                *) _error "argumento $1 desconocido"
            esac
            shift
        done
    else
        echo "$UPPER$LOWER$NUMBERS$SYMBOLS"
    fi
}

generar_contraseñas() {
    local caracteres="$1"
    local cantidad=$(($RANDOM % 5 + 5))
    local tamano

    for (( i=0; i<$cantidad; i++ )); do
        tamano=$(($RANDOM % 8 + 8))
        head /dev/urandom | tr -dc $caracteres | head -c $tamano
        echo
    done
}

main "$@"