upgrade Go to the latest available release

upgrade-go.sh

#!/bin/bash

CURRENT=$(go version | awk '{print $3}')
LATEST=$(curl --silent https://golang.org/VERSION?m=text)


if [[ "${CURRENT}" == "${LATEST}" ]]; then
  echo "You're already using the latest version: ${CURRENT}"
  exit 0
fi

TGZ="${LATEST}.linux-amd64.tar.gz"

wget https://golang.org/dl/${TGZ}

if [[ $? -ne 0 ]]; then
  echo "Failed to download"
  exit 1
fi

sudo rm -rf /usr/local/go && sudo tar -C /usr/local -xzf ${TGZ}

rm ${TGZ}

go version