Updates an existing discord installation to the latest version on Ubuntu

discord-updater.sh

#!/bin/bash
echo -n "detecting installed version: "
installed=$(dpkg -l | awk '$1 == "ii" && $2 == "discord" { print $3 }')
if [[ "$installed" == "" ]]; then
  echo "error"
  exit 1
fi
echo "$installed"

echo -n "detecting latest version: "
url=$( \
  curl --head 'https://discord.com/api/download?platform=linux&format=deb' 2>&1 \
    | sed -nE 's#^location: (.+/discord-([^/]+)\.deb)#\1#ip' \
    | sed -E 's/\r//g' \
  )
latest=$(echo "$url" | sed -nE 's#.+/discord-([^/]+)\.deb#\1#p')
if [[ "$latest" == "" ]]; then
  echo "error"
  exit 2
fi
echo "$latest"

echo -n "updated required: "
if [[ "$installed" == "$latest" ]]; then
  echo "no"
  exit 0
fi
echo "yes"

file="$HOME/Downloads/$(basename "$url")"
echo "download location: $url"
echo "download path: file://$file"

echo -n "download path exists: "
if [[ ! -f "$file" ]]; then
  echo "no"
  echo -n "download status: "
  curl -fsSL -o "$file" "$url"
  if [[ $? -ne 0 ]]; then
    echo "error"
    exit 3
  fi
  echo "ok"
else
  echo "yes"
fi

echo "install required: yes"
sudo apt install -qqy "$file"
if [[ $? -ne 0 ]]; then
  echo "update successful: no"
  exit 4
fi
echo "update successful: yes"