GNU bug report logs - #29648
BUG in zless and similar scripts?

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Package: gzip; Reported by: Michele Venturi <dardo82@HIDDEN>; dated Sun, 10 Dec 2017 18:00:02 UTC; Maintainer for gzip is bug-gzip@HIDDEN.

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Subject: Re: bug#29648: BUG in zless and similar scripts?
To: Paul Eggert <eggert@HIDDEN>
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--001a11379e4e5db79705602effe8
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${var:+value} and ${var+value} differ in how they handle the case when
var="" (i.e. defined, and assigned the empty string).

In this case, the check verifies that LESSMETACHARS is set (even if it's
set to the empty string), so it seems correct as is.

On Tue, Dec 12, 2017 at 4:58 PM, Paul Eggert <eggert@HIDDEN> wrote:

> On 12/10/2017 01:26 AM, Michele Venturi wrote:
>
>> As you can see here:https://pastebin.com/Q7fcrYhp
>> there is an error in the parameters expansion syntax.
>>
>> It should be "${LESSMETACHARS:+set}" and not just
>> "${LESSMETACHARS+set}". zdiff, zgrep and zmore
>> miss a colon in the source code in the same way.
>>
>
> Why is this a bug? I don't see the problem. Can you give an example of
> misbehavior because of the bug?
>
> Perhaps the simplest fix for the bug, once we know what it is, would be to
> remove the workaround for less 394 and earlier, as I doubt whether anyone
> would combine a 'less' that old with new 'gzip'.
>
>
>
>
>

--001a11379e4e5db79705602effe8
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<div dir=3D"ltr">${var:+value} and ${var+value} differ in how they handle t=
he case when var=3D&quot;&quot; (i.e. defined, and assigned the empty strin=
g).<div><br></div><div>In this case, the check verifies that=C2=A0<span sty=
le=3D"font-size:12.8px">LESSMETACHARS is set (even if it&#39;s set to the e=
mpty string), so it seems correct as is.</span></div></div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">On Tue, Dec 12, 2017 at 4:58 PM, =
Paul Eggert <span dir=3D"ltr">&lt;<a href=3D"mailto:eggert@HIDDEN" tar=
get=3D"_blank">eggert@HIDDEN</a>&gt;</span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex"><span class=3D"">On 12/10/2017 01:26 AM, Michele Venturi wro=
te:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
As you can see here:<a href=3D"https://pastebin.com/Q7fcrYhp" rel=3D"norefe=
rrer" target=3D"_blank">https://pastebin.com/Q7fc<wbr>rYhp</a><br>
there is an error in the parameters expansion syntax.<br>
<br>
It should be &quot;${LESSMETACHARS:+set}&quot; and not just<br>
&quot;${LESSMETACHARS+set}&quot;. zdiff, zgrep and zmore<br>
miss a colon in the source code in the same way.<br>
</blockquote>
<br></span>
Why is this a bug? I don&#39;t see the problem. Can you give an example of =
misbehavior because of the bug?<br>
<br>
Perhaps the simplest fix for the bug, once we know what it is, would be to =
remove the workaround for less 394 and earlier, as I doubt whether anyone w=
ould combine a &#39;less&#39; that old with new &#39;gzip&#39;.<br>
<br>
<br>
<br>
<br>
</blockquote></div><br></div>

--001a11379e4e5db79705602effe8--




Information forwarded to bug-gzip@HIDDEN:
bug#29648; Package gzip. Full text available.

Message received at 29648 <at> debbugs.gnu.org:


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Subject: Re: bug#29648: BUG in zless and similar scripts?
To: Michele Venturi <dardo82@HIDDEN>, 29648 <at> debbugs.gnu.org
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On 12/10/2017 01:26 AM, Michele Venturi wrote:
> As you can see here:https://pastebin.com/Q7fcrYhp
> there is an error in the parameters expansion syntax.
>
> It should be "${LESSMETACHARS:+set}" and not just
> "${LESSMETACHARS+set}". zdiff, zgrep and zmore
> miss a colon in the source code in the same way.

Why is this a bug? I don't see the problem. Can you give an example of 
misbehavior because of the bug?

Perhaps the simplest fix for the bug, once we know what it is, would be 
to remove the workaround for less 394 and earlier, as I doubt whether 
anyone would combine a 'less' that old with new 'gzip'.





Information forwarded to bug-gzip@HIDDEN:
bug#29648; Package gzip. Full text available.

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Subject: BUG in zless and similar scripts?
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--94eb2c059aeed2cbb7055ff905d4
Content-Type: text/plain; charset="UTF-8"

As you can see here: https://pastebin.com/Q7fcrYhp
there is an error in the parameters expansion syntax.

It should be "${LESSMETACHARS:+set}" and not just
"${LESSMETACHARS+set}". zdiff, zgrep and zmore
miss a colon in the source code in the same way.
--
http://profiles.google.com/dardo82

--94eb2c059aeed2cbb7055ff905d4
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<div dir=3D"ltr">As you can see here:=C2=A0<a href=3D"https://pastebin.com/=
Q7fcrYhp" target=3D"_blank">https://pastebin.com/<wbr>Q7fcrYhp</a><br><div =
class=3D"gmail_quote"><div dir=3D"ltr"><div>there is an error in the parame=
ters expansion syntax.</div><div><br></div><div>It should be &quot;${LESSME=
TACHARS:+set}&quot; and not just<br></div><div>&quot;${LESSMETACHARS+set}&q=
uot;. zdiff, zgrep and zmore</div><div>miss a colon in the source code in t=
he same way.</div><div><div><div class=3D"m_1262670625548745310gmail_signat=
ure"><div dir=3D"ltr"><div>--</div><a href=3D"http://profiles.google.com/da=
rdo82" target=3D"_blank">http://profiles.google.com/<wbr>dardo82</a></div><=
/div></div></div></div></div></div>

--94eb2c059aeed2cbb7055ff905d4--




Acknowledgement sent to Michele Venturi <dardo82@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gzip@HIDDEN. Full text available.
Report forwarded to bug-gzip@HIDDEN:
bug#29648; Package gzip. Full text available.
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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.