Download a file from your github repository directly (without git clone). You need to get your personal access key at https://github.com/settings/tokens

filedownload.sh

#!/usr/bin/env bash

export GITHUB_ACCESS_TOKEN=""
export GITHUB_USERNAME=""
export REPO_OWNER=""
BRANCH=""
REPO=""
FILE_PATH=""

. ~/.profile

if [ $# -eq 1 ] && [[ "$1" =~ ^https:\/\/github.com\/([a-zA-Z0-9_\-]+)/([a-zA-Z0-9_\-]+)\/blob\/([^\/]+)\/(.+) ]]; then
  REPO_OWNER=${BASH_REMATCH[1]}
  REPO=${BASH_REMATCH[2]}
  BRANCH=${BASH_REMATCH[3]}
  FILE_PATH=${BASH_REMATCH[4]}
else
  if [ $# -ne 2 ]; then
    SCRIPT=$(basename $0)
    echo "Usage"
    echo "  $SCRIPT <repository name> <file path>"
    echo "    or "
    echo "  $SCRIPT https://github.com/<repository owner>/<repository name>/blob/<branch>/<filepath>"
    exit
  fi

  BRANCH="master"
  REPO="$1"
  FILE_PATH="$2"
fi


if [ -z "${GITHUB_ACCESS_TOKEN}" ]; then
  echo "You need to define your GITHUB_ACCESS_TOKEN in ~/.profile"
  exit 1
fi
if [ -z "${GITHUB_USERNAME}" ]; then
  echo "You need to define your GITHUB_USERNAME in ~/.profile"
  exit 1
fi
if [ -z "${REPO_OWNER}" ]; then
  echo "You need to define your REPO_OWNER in ~/.profile"
  exit 1
fi

CURL=$(which curl)
if [ -z "${CURL}" ]; then
  echo "curl command is required."
  exit 1
fi

JQ=$(which jq)
if [ -z "${JQ}" ]; then
  echo "jq command is required."
  exit 1
fi


function CURL_GITHUB () {
  COMMAND="$1"
  echo $(curl \
     -s -L -G \
     --user "${GITHUB_USERNAME}:${GITHUB_ACCESS_TOKEN}" \
     -H "Accept: application/vnd.github.chitauri-preview+sha" \
     "https://api.github.com/repos/${REPO_OWNER}/${REPO}${COMMAND}")
}

#-----------------------------------------
# Get the latest sha of master tree
#-----------------------------------------
TREE_SHA=$(CURL_GITHUB "/commits/${BRANCH}")
if [ -z "${TREE_SHA}" ]; then
  echo "Cannot get the tree sha. Please confirm your credentials."
  exit 1;
fi

#-----------------------------------------
# Get the tree of the parent directory
#-----------------------------------------
PARENT_DIR=$(dirname ${FILE_PATH})
if [[ "${PARENT_DIR}" == "." ]]; then
  PARENT_DIR="/"
fi

FILENAME=$(basename $FILE_PATH)

FILES=$(CURL_GITHUB "/contents/${PARENT_DIR}")
GIT_BLOB_URL=$(echo $FILES | jq -r ".[] | select(.name==\"${FILENAME}\") | .git_url")

curl -s -L -G -r 5 --user "${GITHUB_USERNAME}:${GITHUB_ACCESS_TOKEN}" ${GIT_BLOB_URL} | jq -r ".content" | base64 --decode - > ${FILENAME}