Ios file structure on the issues

Before I knew
Windows file format is pelinux is the elf format.
So I ask, what Apple ios format? Linux-based file format, also elf it?
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Based on Unix
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That he was not the elf ah? Their own roof.
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Why do not people talk. . .
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File format is app
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app file format is really just Jiabao, which has a fixed directory structure
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One possible to see which top
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Hello,
And unix should be similar, elf format.