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如果不使用-f選項NASM會使用默認的輸出文件格式。如果是直接安裝NASM的可執行文件，默認的輸出格式是bin。如果是通過源代碼自行編譯NASM，可以在編譯是使用編譯選項OF_DEFAULT來指定默認的輸出文件格式。
與-o選項一樣，選項與參數之間的空格是可有可無的，因此-oelf和-o elf都是可以的。
可以使用nasm -hf命令來查看NASM支持哪些輸出文件格式