This upgrades the version of Sendy installation for you. It creates a symlink from public_html to the actual version that you are running live. The public_html folder is doc root.

upgrade_sendy.sh

#!/usr/bin/zsh

if [ "$#" -ne 2 ]; then
  echo "Usage: $0 OLD_VERSION NEW_VERSION" >&2
  exit 1
fi

export OLD=$1
export NEW=$2

echo Migrating from $OLD to $NEW

cp $OLD/includes/config.php $NEW/includes/
cp -r $OLD/uploads/ $NEW
cp $OLD/.htaccess $NEW

rm public_html
ln -s $NEW public_html

echo Done