nasm

80x86 assembler for compiling assembly code to machine code

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Netwide Assembler (NASM) is an 80x86 assembler

nasmndisasm

Assemble a simple x86 assembly file to object format$ nasm -f elf64 program.asm -o program.o

Generate assembly listing file with debug information$ nasm -f macho64 code.asm -l code.lst -o code.o

Disassemble binary file to see assembly instructions$ ndisasm -b 64 program.bin