An updater for Atom.

atom-updater.sh

#!/bin/bash

latest=`curl -i "https://github.com/atom/atom/releases/latest" 2>/dev/null | grep "Location: " | cut -d' ' -f2 `
downloadurl=`echo -n "$latest" | sed 's/tag/download/g' | sed 's/$/\/atom-amd64.deb/g' | tr -d '\r'`
version=`echo "$latest" | grep -Eo "v([0-9]+\.){1,}([0-9]+)"`

# Check if file exists
if [ -e .atom-version ]; then
  curver=`cat .atom-version`
else
  curver="unknown"
fi

echo "Latest version is $version."
echo "Current version is $curver."
echo

if [ "$curver" = "$version" ]; then
  # Same version as downloaded version
  echo "You're already using the latest version!"
else
  # Download new version
  if [ -e "atom-amd64-$version.deb" ]; then
    echo "Latest version already downloaded."
  else
    echo "Downloading new version..."
    wget -O "atom-amd64-$version.deb" "$downloadurl"
  fi
  echo
  
  # Install
  echo "Installing new version..."
  dpkg -i "atom-amd64-$version.deb"
  exitcode=$?
  echo
  
  if [ $exitcode -ne 0 ]; then
    # Failed to Install
    echo "Failed to install atom. Are you running with sudo?"
  else
    # Update version file
    echo "Succesfully installed latest version!"
    echo "$version" > .atom-version
  fi
fi