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From: Greg Kochanski <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: /bin/echo: echo: needs to support -- flag
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Date: Thu, 07 Apr 2005 22:13:48 +0100
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Package: coreutils
Version: 5.2.1-2
Severity: normal
File: /bin/echo
Echo does not support the '--' flag.
It should to, otherwise any script containing the line:
echo "$x"
is are prone to unexpected bugs,
if $x is unexpectedly set to
'-n', '-e', or '-E', '--help', or '--version'.
If echo recognized '--', then a script could
be written containing
echo -- "$x"
that would behave properly for all values of $x.
There is a potential security risk, too, but
it is a bit far fetched. It is possible that the ability
to remove an expected newline (by setting x='-n') could be used to
cause errors which someone might be able
to take advantage of.
The kind of place where problems are most likely to appear is
in places like this:
echo "$x" "$y" | program
And, in case you think you can kluge around it,
doing
echo '' "$x"
doesn't work. It immunizes you to unexpected values of x,
but it inserts a space at the beginning of the output.
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.8-2-686
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages coreutils depends on:
ii libacl1 2.2.23-1 Access control list shared library
ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an
-- no debconf information
---------------------------------------
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Date: Thu, 07 Apr 2005 18:56:34 -0400
From: Michael Stone <[EMAIL PROTECTED]>
Subject: Re: Bug#303650: /bin/echo: echo: needs to support -- flag
In-reply-to: <[EMAIL PROTECTED]>
To: Greg Kochanski <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
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On Thu, Apr 07, 2005 at 10:13:48PM +0100, Greg Kochanski wrote:
>Echo does not support the '--' flag.
No it doesn't. Use printf.
Mike Stone
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