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Re: $'\x41\x00\x41' truncates after the first "A"

From: Paul Jarc
Subject: Re: $'\x41\x00\x41' truncates after the first "A"
Date: Wed, 29 Dec 2004 11:10:43 -0500
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.3 (gnu/linux)

address@hidden wrote:
> Description:
>     $'(string1)\x00(string2)' truncates the string at \x00.

The execve() interface underlying the invocation of all external
commands uses \x00 to indicate the end of a string.  There's no way
around it for external commands.  bash could handle builtins
differently, but that inconsistency could lead to trouble.  Consider:
out=`/bin/echo "$var"`
test "$var" = "$out"
You would expect this test to always exit 0, but if var could contain
null characters, and if the internal test command could see those,
then the test would fail.


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