Correction needed in the slide

file extension seems incorrect for gunzip and unxz command examples.

I see they are correct.
Please clarify more how to correct them if they are incorrect?

gunzip

In the picture gunzip test1.img : instead of gunzip test1.img.gz
in the picture du -sh test2.img.gz : instead of du -sh test1.img

unxz

in the picture unxz test2.img : instead of unxz test2.img.xz
In the picture du -sh test2.img.xz instead of du -sh test2.img

Please correct me if I am wrong.

@Ayman
Have you checked it?