nasm -h  #  linux way to get help for calling a program

usage: nasm [-@ response file] [-o outfile] [-f format] [-l listfile]
            [options...] [--] filename
    or nasm -v   for version info

    -t          assemble in SciTech TASM compatible mode
    -g          generate debug information in selected format
    -E (or -e)  preprocess only (writes output to stdout by default)
    -a          don't preprocess (assemble only)
    -M          generate Makefile dependencies on stdout
    -MG         d:o, missing files assumed generated
    -MF <file>  set Makefile dependency file
    -MD <file>  assemble and generate dependencies
    -MT <file>  dependency target name
    -MQ <file>  dependency target name (quoted)
    -MP         emit phony target

    -Z<file>    redirect error messages to file
    -s          redirect error messages to stdout

    -F format   select a debugging format

    -I<path>    adds a pathname to the include file path
    -O<digit>   optimize branch offsets
                -O0: No optimization
                -O1: Minimal optimization
                -Ox: Multipass optimization (default)

    -P<file>    pre-includes a file
    -D<macro>[=<value>] pre-defines a macro
    -U<macro>   undefines a macro
    -X<format>  specifies error reporting format (gnu or vc)
    -w+foo      enables warning foo (equiv. -Wfoo)
    -w-foo      disable warning foo (equiv. -Wno-foo)

--prefix,--postfix
  this options prepend or append the given argument to all
  extern and global variables

Warnings:
    error                   treat warnings as errors (default off)
    macro-params            macro calls with wrong parameter count (default on)
    macro-selfref           cyclic macro references (default off)
    macro-defaults          macros with more default than optional parameters (default on)
    orphan-labels           labels alone on lines without trailing `:' (default on)
    number-overflow         numeric constant does not fit (default on)
    gnu-elf-extensions      using 8- or 16-bit relocation in ELF32, a GNU extension (default off)
    float-overflow          floating point overflow (default on)
    float-denorm            floating point denormal (default off)
    float-underflow         floating point underflow (default off)
    float-toolong           too many digits in floating-point number (default on)
    user                    %warning directives (default on)
    lock                    lock prefix on unlockable instructions (default on)
    hle                     invalid hle prefixes (default on)

response files should contain command line parameters, one per line.

For a list of valid output formats, use -hf.
For a list of debug formats, use -f <form> -y.
usage: nasm [-@ response file] [-o outfile] [-f format] [-l listfile]
            [options...] [--] filename
    or nasm -v   for version info

    -t          assemble in SciTech TASM compatible mode
    -g          generate debug information in selected format
    -E (or -e)  preprocess only (writes output to stdout by default)
    -a          don't preprocess (assemble only)
    -M          generate Makefile dependencies on stdout
    -MG         d:o, missing files assumed generated
    -MF <file>  set Makefile dependency file
    -MD <file>  assemble and generate dependencies
    -MT <file>  dependency target name
    -MQ <file>  dependency target name (quoted)
    -MP         emit phony target

    -Z<file>    redirect error messages to file
    -s          redirect error messages to stdout

    -F format   select a debugging format

    -I<path>    adds a pathname to the include file path
    -O<digit>   optimize branch offsets
                -O0: No optimization
                -O1: Minimal optimization
                -Ox: Multipass optimization (default)

    -P<file>    pre-includes a file
    -D<macro>[=<value>] pre-defines a macro
    -U<macro>   undefines a macro
    -X<format>  specifies error reporting format (gnu or vc)
    -w+foo      enables warning foo (equiv. -Wfoo)
    -w-foo      disable warning foo (equiv. -Wno-foo)

--prefix,--postfix
  this options prepend or append the given argument to all
  extern and global variables

Warnings:
    error                   treat warnings as errors (default off)
    macro-params            macro calls with wrong parameter count (default on)
    macro-selfref           cyclic macro references (default off)
    macro-defaults          macros with more default than optional parameters (default on)
    orphan-labels           labels alone on lines without trailing `:' (default on)
    number-overflow         numeric constant does not fit (default on)
    gnu-elf-extensions      using 8- or 16-bit relocation in ELF32, a GNU extension (default off)
    float-overflow          floating point overflow (default on)
    float-denorm            floating point denormal (default off)
    float-underflow         floating point underflow (default off)
    float-toolong           too many digits in floating-point number (default on)
    user                    %warning directives (default on)
    lock                    lock prefix on unlockable instructions (default on)
    hle                     invalid hle prefixes (default on)

response files should contain command line parameters, one per line.

nasm -hf # many output formats available, we use -f elf64

valid output formats for -f are (`*' denotes default):
  * bin       flat-form binary files (e.g. DOS .COM, .SYS)
    ith       Intel hex
    srec      Motorola S-records
    aout      Linux a.out object files
    aoutb     NetBSD/FreeBSD a.out object files
    coff      COFF (i386) object files (e.g. DJGPP for DOS)
    elf32     ELF32 (i386) object files (e.g. Linux)
    elf64     ELF64 (x86_64) object files (e.g. Linux)
    elfx32    ELFX32 (x86_64) object files (e.g. Linux)
    as86      Linux as86 (bin86 version 0.3) object files
    obj       MS-DOS 16-bit/32-bit OMF object files
    win32     Microsoft Win32 (i386) object files
    win64     Microsoft Win64 (x86-64) object files
    rdf       Relocatable Dynamic Object File Format v2.0
    ieee      IEEE-695 (LADsoft variant) object file format
    macho32   NeXTstep/OpenStep/Rhapsody/Darwin/MacOS X (i386) object files
    macho64   NeXTstep/OpenStep/Rhapsody/Darwin/MacOS X (x86_64) object files
    dbg       Trace of all info passed to output stage
    elf       ELF (short name for ELF32)
    macho     MACHO (short name for MACHO32)
    win       WIN (short name for WIN32)