#! /bin/bash

# Special permissions for the shared music:
# dirs : drwxr-s---
# files: -rw-r-----

# Partly achieved by setting umask of subshell:

umask 0027
bash


# If these get out of hand on you
# and it's necessary to repair a whole tree:

# $ find TOP -type d -exec chmod 2750 {} \;
# $ find TOP -type f -exec chmod 640 {} \;