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Date: Thu, 8 Jan 2009 05:22:02 -0800
From: David Wolfskill <david@catwhisker.org>
To: Damien Fleuriot <dam@c-mal.com>
Message-ID: <20090108132202.GD64787@albert.catwhisker.org>
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Cc: freebsd-current@freebsd.org
Subject: Re: Bug or unwanted behaviour in echo ?
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On Thu, Jan 08, 2009 at 01:37:06PM +0100, Damien Fleuriot wrote:
> ...
> I was toying around with a site that proposed to hash passwords to
> MD5, and comparing results with my host running FreeBSD 7.0-STABLE
>=20
> At some point I didn't get the same hash from the website and from BSD.
>=20
> On BSD:
> echo -n "test'$@" | md5
> 5c28a8c6d799d302f3ef53afefdfc81b
>=20
> On website:
> f883cdacbb478c241c51da1f67fbe9bf
>=20
> After swapping characters around I realized that echo just interprets
> $@ (which in our case is null).

Errr... no, I think you will find that what echo saw was actually
a string whose md5 hash was "5c28a8c6d799d302f3ef53afefdfc81b".
The "$@" was seen as a token by the shell, its value interpolated,
and passed along to echo (which may well have been a shell builtin
in any case, depending on what shell you were using).

That's what escaping the "$" worked.

> ...=20

Peace,
david
--=20
David H. Wolfskill				david@catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.

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