@lqlarry It looks mostly fine. A couple things jump out:
1) tar uses "$n", all others use "./$n"
2) The case part with "${n%,}" seems odd given that "$n" was immediately before tested for being a file.
3) .cso and .zlib delete the original file.
4) Personally, I would run most of the echos through stderr (" >&2").
5) Because I am unfamiliar with hdiutil in MacOS, I am (maybe needlessly) suspicious of not testing for the existance of, and maybe creating, the mountpoint before mounting.