easy version manager for nodejs

node-version

#!/usr/bin/env bash

set -e

[[ ! -z "$1" ]] && export LOCAL_BIN="$1"
[[ -z "${LOCAL_BIN}" ]] && export LOCAL_BIN="${HOME}/bin"
[[ ! -d "${LOCAL_BIN}" ]] && mkdir -p "${LOCAL_BIN}"

[[ -z "${NODEJSVERSION}" ]] && export NODEJSVERSION="6.11.2"
[[ -z "${NODEJSOS}" ]] && export NODEJSOS="linux"
[[ -z "${NODEJSARCH}" ]] && export NODEJSARCH="x64"

export NODEJSROOT="${LOCAL_BIN}/node-v${NODEJSVERSION}-${NODEJSOS}-${NODEJSARCH}"

export NODEJS_DIST_URI="https://nodejs.org/dist/v${NODEJSVERSION}/node-v${NODEJSVERSION}-${NODEJSOS}-${NODEJSARCH}.tar.xz"

export NODEJS_DIST_LOCAL="/tmp/node-${NODEJSVERSION}.tar.xz"
export NODEJS_DIST_LOCAL_TAR="/tmp/node-${NODEJSVERSION}.tar"
export NODEJS_TEMP_ROOT="/tmp/node-v${NODEJSVERSION}-${NODEJSOS}-${NODEJSARCH}"

if [[ ! -f "${NODEJSROOT}/bin/nodejs" ]]; then
  if [[ ! -f "${NODEJS_DIST_LOCAL_TAR}" ]]; then
    wget -c -O "${NODEJS_DIST_LOCAL}" "${NODEJS_DIST_URI}"
    xz --decompress "${NODEJS_DIST_LOCAL}"
  fi

  tar xf "${NODEJS_DIST_LOCAL_TAR}" -C "${LOCAL_BIN}"

  mv "${NODEJS_TEMP_ROOT}" "${NODEJSROOT}"

else
  echo "the required NodeJS binary is locally available"

fi

export PATH="${NODEJSROOT}/bin:${PATH}"

echo ""
echo "add following line to your profile:"
echo ""
echo "                 export NODEJSROOT=\"${LOCAL_BIN}/node-v${NODEJSVERSION}-${NODEJSOS}-${NODEJSARCH}\""
echo "                 export PATH=\"${NODEJSROOT}/bin:\${PATH}\""