Helper script to update docker-machine to latest version from github. Could be run in cron if you want to keep up to date. Can modify to be applicable to any app

update-docker-machine

#!/usr/bin/env bash

[ "$EUID" -ne 0 ] && { echo >&2 "Please run as root or with sudo"; exit 2; }

INSTALL_LOCATION="/usr/local/bin/docker-machine"
REPO=docker/machine
VERSION=`curl -s "https://github.com/${REPO}/releases/latest/download" 2>&1 | grep -Po [0-9]+\.[0-9]+\.[0-9]+`
[ -z "$VERSION" ] && echo >&2 "Could not get latest version from ${REPO}!"

if command -v docker-machine >/dev/null 2>&1; then
  CURRENT_VERSION=`docker-machine --version | grep -Po [0-9]+\.[0-9]+\.[0-9]+`
  [[ "$CURRENT_VERSION" == "$VERSION" ]] && { echo >&2 "Docker Machine is already the latest version $VERSION"; exit 1; }
fi

echo "Downlaoding Docker Machine v${VERSION}" && \
curl -s -L "https://github.com/${REPO}/releases/download/v${VERSION}/docker-machine-`uname -s`-`uname -m`" >"/tmp/docker-machine" && \
echo "Installing Docker Machine" && \
install "/tmp/docker-machine" "$INSTALL_LOCATION" && echo "Done!" || echo >&2 "Failed!"
[ -f "/tmp/docker-machine" ] && rm "/tmp/docker-machine"