syntax:  expando <filename>

    -k      Don't delete the container files after expanding them.

    -r      Search subdirectories for files that can be expanded.

            When files are specified for <filename>, this option isn't needed
            because containers-within-containers are always automatically
            expanded.  This option is only required when directories are given
            for <filename>, and searching must be done to find the top-level
            containers.

    -m      Rather than duplicating files, try to keep everything loop-mounted,
            though this requires UnionFS and a bunch of ramdisks.



Example usage:

    $ expando slax.iso
    expanding slax.iso
    expanding slax.iso!/boot/initrd.gz
    expanding slax.iso!/slax/slaxsave.zip
    expanding slax.iso!/slax/modules/1-001-core.lzm