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Using the first command, the file system size will be 2 Gb, while in the second way we are subtracting 2 Gb from the current size,
if we don't know the current size we won't be able to know what size the file system will be exactly.
'''Question 3. What is "GRUB"?'''
Is a boot loader package, if a computer has more that one Operative System it allows to the users choose which one run when the computer starts.