Easy way to locally setup scribd download, firefox, selenium, geckodriver... and make sure that you don't have outdated version.

set_up_local_scribd_download.sh

#!/usr/bin/env bash
set -e

function usage_end(){
    echo "======================================"
    echo "Great, you downloaded everything."
    echo "Now (and later), just run the following to load the path:"
    echo "$ bash set_up_local_scribd_download.sh"
    echo "And then use the scribd downloader like this:"
    echo "$ scribd_downloader_3.py <your url> <your output.pdf>"
    echo "E.g:"
    echo "$ scribd_downloader_3.py https://www.scribd.com/doc/63942746/chopin-nocturne-n-20-partition chopin.pdf"
    echo "If if fails, then please report here:"
    echo "  https://github.com/tobiasBora/scribd-downloader-3/issues/"
    echo "Enjoy !"
}

if [ -d "./download_everything" ]
then
    echo "======================================"
    echo "It looks like you already ran this script before."
    echo "So I'll define for you all the environment variable"
    cd download_everything
    source venv/bin/activate
    export PATH="$(pwd):$(pwd)/scribd-downloader-3:$(pwd)/firefox:$PATH"
    echo "Great, now you can just run :"
    echo "$ scribd_downloader_3.py <your url> <your output.pdf>"
    echo "E.g:"
    echo "$ scribd_downloader_3.py https://www.scribd.com/doc/63942746/chopin-nocturne-n-20-partition chopin.pdf"
    echo "Enjoy !"
    exit 0
fi

mkdir download_everything
cd download_everything

# Make sure virtualenv is installed and has last version
if ! which pip3 > /dev/null; then
    echo "/!\ pip3 is not installed."
    echo "Please, make sure to install it using something like:"
    echo "sudo apt-get install python3-pip"
    echo "For more details, see https://stackoverflow.com/questions/6587507/how-to-install-pip-with-python-3"
    exit 1
fi
pip3 install --user virtualenv
pip3 install --upgrade virtualenv

# Create a new virtual env
virtualenv -p python3 venv

# Activate it
source venv/bin/activate
pip3 install selenium
pip3 install fpdf
pip3 install Pillow
git clone https://github.com/tobiasBora/scribd-downloader-3.git
export PATH="$(pwd)/scribd-downloader-3:$PATH"

# Detect architecture
unameOut="$(uname -s)"
case "${unameOut}" in
    Linux*)     machine="Linux";;
    *)          echo "Machine not supported, please report back if you have any problem."
		exit 1
esac
if [ "$machine" == "Linux" ]; then
    archs=`uname -m`
    case "$archs" in
	i?86) arch="linux32" ;;
	x86_64) arch="linux64" ;;
	*) arch="Architecture not supported, please report back if you have any problem." ;;
    esac
fi

# Download firefox
case "${arch}" in
    linux32) wget https://ftp.mozilla.org/pub/firefox/releases/58.0/linux-i686/en-GB/firefox-58.0.tar.bz2
	     tar jxvf firefox-58.0.tar.bz2;;
    linux64) wget https://ftp.mozilla.org/pub/firefox/releases/58.0/linux-x86_64/en-GB/firefox-58.0.tar.bz2
	     tar jxvf firefox-58.0.tar.bz2;;
esac
export PATH="$(pwd)/firefox:$PATH"

# Download geckodriver
case "${arch}" in
    linux32*) wget https://github.com/mozilla/geckodriver/releases/download/v0.19.1/geckodriver-v0.19.1-linux32.tar.gz
	      tar zxvf geckodriver-v0.19.1-linux32.tar.gz;;
    linux64*) wget https://github.com/mozilla/geckodriver/releases/download/v0.19.1/geckodriver-v0.19.1-linux64.tar.gz
	      tar zxvf geckodriver-v0.19.1-linux64.tar.gz;;
esac
export PATH="$(pwd):$PATH"


# Test
echo "$PATH"
usage_end
exec /bin/bash

how can i use this? help please