dash-app-multi-user

#!/bin/sh

# Dash app multi-user directory is in /Library
main_dir="/Library/Application\ Support/Dash"
user_dir="$HOME/Library/Application\ Support/Dash"

# If the main dir exists, and the user dir is a symlink,
# then we have already accomplished our goal, so exit.
test -d "$main_dir" && test -L "$user_dir" && exit 0

# If the main dir is missing, and the user dir exists,
# then move the existing user dir to become the main dir,
# then also adjust the permissions to be group writeable.
test -e "$main_dir" || test -e "$user_dir" && sudo mv "$user_dir" "$main_dir" && sudo find "$main_dir" -exec chmod g+w {} \;

# If the main dir exists, and the user dir exists and is not a symlink, 
# then delete the user dir because it's now superflous.
test -e "$main_dir" && test -d "$user_dir" && test -L "$user_dir" || rm -rf "$user_dir"

# If the main dir exists, and the user dir is missing,
# then symlink the main dir to the user dir.
test -e "$main_dir" && test -e "$user_dir" || sudo ln -s "$main_dir" "$user_dir"