what does the purpose of minimize script?

[nivazri]

packer-templates/scripts/common/minimize.sh
whats is the purpose of this script?

[kaorimatz]

It zeros out unused disk blocks so that those blocks can be removed from the underlying virtual disk.

[ek9]

As previously explained, it removes unused space, so that the resulting image (.box file) can be better compressed. Results in smaller size .box files.

As it was answered, I suggest to close tihs.

[jcrben]

I recommend putting this in a comment inside the file instead.