Re: appimage magic
On Mon, 11 Nov 2024, David Wright wrote:
> On Tue 12 Nov 2024 at 02:47:21 (+0000), fxkl47BF@protonmail.com wrote:
>> i down loaded super_program.appimage
>> on the command line i type ./super_program.appimage
>> how does my debian powered device know what to do
>
> It looks at the file signature, or "magic number", in the first few
> bytes of the file. For example, type:
>
> $ hexdump -C /bin/cat | head -n 1
> 00000000 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
> $
>
> and the 7f 45 4c 46 sequence means Executable and Linkable Format.
> OTOH, in:
>
> $ hexdump -C /bin/firefox | head -n 1
> 00000000 23 21 2f 62 69 6e 2f 73 68 0a 0a 46 49 52 45 46 |#!/bin/sh..FIREF|
> $
>
> the first two bytes, 23 21, indicate that the file should be passed
> to the program whose name immediately follows, ie /bin/sh, which is
> normally the dash shell in Debian.
>
> See https://en.wikipedia.org/wiki/List_of_file_signatures for
> loads more magic numbers.
>
> Cheers,
> David.
>
i don't see anything in that about appimage
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