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Re: echo $'\0' >a does not write the nul byte

From: Martin Schulte
Subject: Re: echo $'\0' >a does not write the nul byte
Date: Sun, 17 Jan 2021 21:56:57 +0100

Hello Hans, hello Eduardo!

> On Sun, Jan 17, 2021 at 12:05 PM <hans@artax.karlin.mff.cuni.cz> wrote:
> > (...)
> >         The nul byte is not echoed by $'\0'.
> This is expected. Bash uses NUL-byte terminated character sequences to
> store strings, so it can't actually store NUL bytes themselves.

To be exact, this is already caused by a Unix Kernel - strings passed by the 
exex* system calls are null terminated, too. As it is the default in the C 
programming language. Thus you can't pass a null byte in an argument when 
invoking a program.

Best regards


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