ExpressVPN Update Manual Bash Helper with Automation support!

#!/bin/bash

# Create directories
mkdir -p ExpressVPN_tmp ExpressVPN_bak

# Move existing files to backup directory
mv expressvpn* ExpressVPN_bak
expressvpn status

echo "Main: https://www.expressvpn.com/latest#linux ;; Clients: https://www.expressvpn.works/clients/linux/"

if [[ "$1" -eq "" ]]; then
    read -p "ExpressVPN Fedora link: " link
else
    link="$1"
    printf "Given ExpressVPN(.Works: %s)\n" "$1"
fi

cd ExpressVPN_tmp

# Check if the link is HTTPS
if [[ "$link" =~ ^https:// ]]; then
    echo "Detected HTTPS link. Proceeding."
else
    echo "Error: no HTTPS detected. Exiting."
    exit 1
fi

# Clear temporary files
rm *

# Download the files
echo
wget "$link"
error1=$?
wget "$link.asc"
error2=$?
echo

# Check for download errors
if [[ $error1 -ne 0 ]] || [[ $error2 -ne 0 ]]; then
    echo "Exiting due to download errors."
    exit 2
fi

# Find RPM and ASC files
file_rpm=$(ls *.rpm)
file_asc=$(ls *.asc)

# Check file names
if [[ "$file_rpm" = expressvpn*.rpm ]] && [[ "$file_asc" = "$file_rpm.asc" ]]; then
    printf "Found \"%s\" and \"%s\". Proceeding.\n" "$file_rpm" "$file_asc"
else
    printf "Error: must have expressvpn*.rpm=\"%s\" and expressvpn*.rpm.asc=\"%s\". Exiting.\n" "$file_rpm" "$file_asc"
    exit 3
fi

# Calculate file hashes
sha256_rpm=$(sha256sum "$file_rpm")
sha256_asc=$(sha256sum "$file_asc")
sha512_rpm=$(sha512sum "$file_rpm")
sha512_asc=$(sha512sum "$file_asc")

printf "The SHA256 of \"%s\" and \"%s\".\nThe SHA512 of \"%s\" and \"%s\".\n" "$sha256_rpm" "$sha256_asc" "$sha512_rpm" "$sha512_asc"

echo "Reading \"$file_asc\":"
cat "$file_asc"

# Verify the ASC file with GPG
gpg --verify "$file_asc"
if [[ $? -ne 0 ]]; then
    echo "Signature error."
    exit 4
else
    echo "GPG verification successful. Proceeding."
fi

# Check root access
if [[ "$(sudo whoami)" = "root" ]]; then
    echo "Root access granted. Proceeding."
else
    echo "Root access denied. Exiting."
    exit 5
fi

cd ..

# Backup existing files
mv expressvpn* ExpressVPN_bak

# Move new files to the current directory
mv ExpressVPN_tmp/* .

# Install the RPM package
sudo dnf install -y "$file_rpm"

# Upgrade packages and refresh
sudo dnf upgrade -y --refresh

# Restart expressvpn service
sudo systemctl restart expressvpn --now

# Wait and check on service
sleep 5
sudo systemctl status expressvpn

# Connect to expressvpn
expressvpn connect smart