Len equ $ - msg length of our dear string Msg db 'Hello, world!',0xa our dear string Global _start must be declared for linker (ld) Also you need to know the binary format, which also tend to vary, although ELF (Executable and Linkable Format) is universal across few flavors of Unix and Linux. Which of course varies by operating system. It's bit more complicated, because actually printing "Hello, world!" to stdout is a system call, thus you need to know the correct kernel syscall number.
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