Suppose you want to share the directory foo.

# recursively change group
find foo -name "*" -exec chgrp ac-group {} \;

# recursively change permission of files
find foo -type f -exec chmod g+rw {} \;

# recursively change permission of directories
find foo -type d -exec chmod 770 {} \;

NOTE: You must also make sure that the group has read and execute privileges for all parent directories containing foo.

-- Main.cthachuk - 04 Aug 2010