Packer: What is a BSD or GNU style checksum file?

[sandersaares]

From the documentation:

iso_checksum_url (string) - A URL to a GNU or BSD style checksum file containing a checksum for the OS ISO file.

I have no idea what these checksum file styles refer to. Google ends me up at BSD checksum but that can't be right.

I request clarification to this documentation. Inline examples or references to examples would be nice.

[rickard-von-essen]

BSD's implementation of md5 will output:

MD5 (other.iso) = <checksum>
MD5 (the-OS.iso) = <checksum>

While the GNU implementation of md5sum will output:

<checksum> *the-OS.iso
<checksum>  other.iso

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