Download `bin/hub` for the current environment

hub-get.sh

#!/bin/bash
set -e

latest-version() {
  curl -fsi https://github.com/github/hub/releases/latest | awk -F/ '/^Location:/ {print $(NF)}'
}

HUB_VERSION="${1#v}"
if [ -z "$HUB_VERSION" ]; then
  latest=$(latest-version) || true
  [ -n "$latest" ] || latest="v2.12.8"
  cat <<MSG >&2
Error: You must specify a version of hub via the first argument. Example:
  curl <script> | bash -s ${latest#v}
MSG
  exit 1
fi

ARCH="amd64"
OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
[[ $OS != mingw* ]] || OS="windows"

download() {
  if [ "$OS" = windows ]; then
    zip="${1%.tgz}.zip"
    curl -fsSLO "$zip"
    unzip "$(basename "$zip")" bin/hub.exe
    rm -f "$zip"
  elif [ "$OS" = darwin ]; then
    curl -fsSL "$1" | tar xz --strip-components=1 '*/bin/hub'
  else
    curl -fsSL "$1" | tar xz --strip-components=1 --wildcards '*/bin/hub'
  fi
}

download "https://github.com/github/hub/releases/download/v$HUB_VERSION/hub-$OS-$ARCH-$HUB_VERSION.tgz"

bin/hub version
if [ -z "$GITHUB_TOKEN" ]; then
  cat <<MSG >&2
Warning: We recommend supplying the GITHUB_TOKEN environment variable to avoid
being prompted for authentication.
MSG
fi