Get latest github release

get-latest-github-release.sh

#!/usr/bin/env bash
set -e

if [[ "$#" != "2" ]]; then
        echo "USAGE:"
        echo "get-latest-github-release.sh <user> <repo> [file extension] [outfile]"
        exit 1
fi

repo="${1}/${2}"
[[ ! -z "$3" ]] && file_type="$3"
file_type=tar.gz

outfile="/tmp/${2}.${file_type}"
[[ ! -z "$4" ]] && outfile="$4"

url=`curl -s \
        https://api.github.com/repos/${repo}/releases/latest | \
        grep "browser_download_url.*.${file_type}" | \
        cut -d : -f 2,3 | tr -d \"`

wget $url -O $outfile