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I'm learning to create my very own Plymouth theme. I found that besides the images and the scripts, the default ubuntu-logo theme has a file named ubuntu-logo.grub. What is this file for? Should I copy it to my own theme and rename?

I'm running Ubuntu 16.04.

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After searching around about plymouth, I think the file has something to do with grub2. The content of the file reads

if background_color 44,0,30,0; then
  clear
fi

Which is the color of grub2's boot menu (red: 44, green:0, blue: 30, transparency: 0) that you see if you have multiple OS's installed.

But I still don't know what clear means, or why it has an if statement.

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