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assemblykerneldd

Explaination of dd command in nasm

I am reading osdev wiki. I came across these two lines of code. 

 nasm kernel.asm -f bin -o kernel.bin
    dd if=kernel.bin of=/dev/fd0

I can understand the first line but I can't understand the second line. what the second line do? what is this dd command? what is this /dev/fd0 here? Can anybody explain me this please? Thanks in advance.

Solution

  • dd is a utility that allows you to copy a file. The if parameter stands for 'input file' and of is output file. The command here is copying the kernel.bin onto the /dev/fd0 device.