This is a simple Bash function for downloading a specific folder from a GitHub Repository which I created from this [link](https://stackoverflow.com/a/44109535). You can place this inside your bashrc or any other file. As far as testing goes, everything seems to be working fine.

git-grab.sh

# custom download git folder function/command
git-grab() {
  if [ $# -lt 3 ];  then
    # Display Help
    echo "This function will download specific folder/directory of a github repo"
    echo
    echo "Syntax: git-grab <user-name> <repo-name> <directory>               # download from master branch"
    echo "Syntax: git-grab <user-name> <repo-name> <branch> <directory>      # download from a specific branch"
    echo
  elif [ $# -eq 3 ];  then
    wget -O - https://github.com/"$1"/"$2"/archive/master.tar.gz | tar -xz --strip=2 "$2-master/$3";
  else
    wget -O - https://github.com/"$1"/"$2"/archive/"$3".tar.gz | tar -xz --strip=2 "$2-$3/$4";
  fi
}