GNU bug report logs - #27916
sed is limited to 24 patterns when using the delete command

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: jean-christophe manciot <actionmystique <at> gmail.com>
To: bug-sed <at> gnu.org
Subject: sed is limited to 24 patterns when using the delete command
Date: Wed, 2 Aug 2017 15:35:53 +0200

[Message part 1 (text/plain, inline)]

sed (GNU sed) 4.4

*With 24 patterns, sed filters correctly 'build-aux':*
root <at> samsung-ubuntu:/home/actionmystique/src# find -L -path
'./*/build-*.sh' 2>/dev/null | sed -E '/\.gd.*$/d;
/.*git-Tao_Te_eChing.*$/d; /.*\.gnupg.*$/d; /.*google-chrome.*$/d;
/.*\.gpg$/d; /.*_key.*$/d; /.*\/\.key.*$/d; /.*\/key.*$/d; /.*\.key$/d;
/.*_Key.*$/d; /.*\..*\.luks$/d; /.*OAuth2.*$/d; /.*\/\.passwd.*$/d;
/.*\/passwd.*$/d; /.*\/\.password.*$/d; /.*\/password.*$/d; /.*\.pem$/d;
/.*\.ssh.*$/d; /.*\/tmp.*$/d; /.*\/Trash.*$/d; /.*Webmin.*$/d; /.*xca.*$/d;
/.*build-area.*$/d; /.*build-aux.*$/d' | grep -- "build-aux"
root <at> samsung-ubuntu:/home/actionmystique/src#

*With 25 patterns, sed fails to filter 'build-aux*':
root <at> samsung-ubuntu:/home/actionmystique/src# find -L -path
'./*/build-*.sh' 2>/dev/null | sed -E '/.*ExpressVPN/client\..*$/d;
/\.gd.*$/d; /.*git-Tao_Te_eChing.*$/d; /.*\.gnupg.*$/d;
/.*google-chrome.*$/d; /.*\.gpg$/d; /.*_key.*$/d; /.*\/\.key.*$/d;
/.*\/key.*$/d; /.*\.key$/d; /.*_Key.*$/d; /.*\..*\.luks$/d; /.*OAuth2.*$/d;
/.*\/\.passwd.*$/d; /.*\/passwd.*$/d; /.*\/\.password.*$/d;
/.*\/password.*$/d; /.*\.pem$/d; /.*\.ssh.*$/d; /.*\/tmp.*$/d;
/.*\/Trash.*$/d; /.*Webmin.*$/d; /.*xca.*$/d; /.*build-area.*$/d;
/.*build-aux.*$/d' | grep -- "build-aux"
./GTK-VNC/git-gtk-vnc/build-aux/ltmain.sh
./Xtables/xtables-addons/debian/xtables-addons-dkms/usr/src/xtables-addons-2.12/build-aux/ltmain.sh
./Xtables/xtables-addons/build-aux/ltmain.sh
...

*With the same 25 patterns grep filters correctly 'build-aux':*
root <at> samsung-ubuntu:/home/actionmystique/src# find -L -path
'./*/build-*.sh' 2>/dev/null | grep -vP --
'.*ExpressVPN/client\..*$|\.gd.*$|.*git-Tao_Te_eChing.*$|.*\.gnupg.*$|.*google-chrome.*$|.*\.gpg$|.*_key.*$|.*\/\.key.*$|.*\/key.*$|.*\.key$|.*_Key.*$|.*\..*\.luks$|.*OAuth2.*$|.*\/\.passwd.*$|.*\/passwd.*$|.*\/\.password.*$|.*\/password.*$|.*\.pem$|.*\.ssh.*$|.*\/tmp.*$|.*\/Trash.*$|.*Webmin.*$|.*xca.*$|.*build-area.*$|.*build-aux.*$'
| grep -- "build-aux"
root <at> samsung-ubuntu:/home/actionmystique/src#

It's strange that 24 is the limit.
-- 
Jean-Christophe Manciot

[Message part 2 (text/html, inline)]

Message #8 received at 27916 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: jean-christophe manciot <actionmystique <at> gmail.com>, 27916 <at> debbugs.gnu.org
Subject: Re: bug#27916: sed is limited to 24 patterns when using the delete
 command
Date: Wed, 2 Aug 2017 23:58:02 -0600

Hello,

from a cursory look:

On 08/02/2017 07:35 AM, jean-christophe manciot wrote:
> *With 25 patterns, sed fails to filter 'build-aux*':
> root <at> samsung-ubuntu:/home/actionmystique/src# find -L -path
> './*/build-*.sh' 2>/dev/null | sed -E '/.*ExpressVPN/client\..*$/d;
> /\.gd.*$/d; /.*git-Tao_Te_eChing.*$/d; /.*\.gnupg.*$/d;
[...]

Could it be that this 25th pattern that you've added (as the first
sed command) has an un-escaped slash, which messes up the rest of the
patterns ?

That is, the sed command "/.*ExpressVPN/client\..*$/d;'
actually means: match lines with "ExpressVPN",
then "c" (change) the lines to "lient\n..*$d/;".

Example:

  $ echo "ExpressVPN" | sed -E '/.*ExpressVPN/client\..*$/d;'
  lient..*$/d;

And, if this is the first pattern, then all the rest of the text
is treated as the same line to change, and not as additional sed
patterns:

  $ echo "ExpressVPN" | sed -E '/.*ExpressVPN/client\..*$/d;
  /Anything Else/d'

  lient..*$/d; /Anything Else/d


This is a just a quick guess, I haven't been able to reproduce
what you're seeing otherwise.

regards,
 - assaf

Message #11 received at 27916 <at> debbugs.gnu.org (full text, mbox):

From: jean-christophe manciot <actionmystique <at> gmail.com>
To: Assaf Gordon <assafgordon <at> gmail.com>
Cc: 27916 <at> debbugs.gnu.org
Subject: Re: bug#27916: sed is limited to 24 patterns when using the delete
 command
Date: Thu, 3 Aug 2017 11:00:59 +0200

[Message part 1 (text/plain, inline)]

You're right, my bad.

On Thu, Aug 3, 2017 at 7:58 AM, Assaf Gordon <assafgordon <at> gmail.com> wrote:

> Hello,
>
> from a cursory look:
>
> On 08/02/2017 07:35 AM, jean-christophe manciot wrote:
> > *With 25 patterns, sed fails to filter 'build-aux*':
> > root <at> samsung-ubuntu:/home/actionmystique/src# find -L -path
> > './*/build-*.sh' 2>/dev/null | sed -E '/.*ExpressVPN/client\..*$/d;
> > /\.gd.*$/d; /.*git-Tao_Te_eChing.*$/d; /.*\.gnupg.*$/d;
> [...]
>
> Could it be that this 25th pattern that you've added (as the first
> sed command) has an un-escaped slash, which messes up the rest of the
> patterns ?
>
> That is, the sed command "/.*ExpressVPN/client\..*$/d;'
> actually means: match lines with "ExpressVPN",
> then "c" (change) the lines to "lient\n..*$d/;".
>
> Example:
>
>   $ echo "ExpressVPN" | sed -E '/.*ExpressVPN/client\..*$/d;'
>   lient..*$/d;
>
> And, if this is the first pattern, then all the rest of the text
> is treated as the same line to change, and not as additional sed
> patterns:
>
>   $ echo "ExpressVPN" | sed -E '/.*ExpressVPN/client\..*$/d;
>   /Anything Else/d'
>
>   lient..*$/d; /Anything Else/d
>
>
> This is a just a quick guess, I haven't been able to reproduce
> what you're seeing otherwise.
>
> regards,
>  - assaf
>
>


-- 
Jean-Christophe

[Message part 2 (text/html, inline)]

Message #16 received at 27916-done <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: jean-christophe manciot <actionmystique <at> gmail.com>
Cc: Assaf Gordon <assafgordon <at> gmail.com>, 27916-done <at> debbugs.gnu.org
Subject: Re: bug#27916: sed is limited to 24 patterns when using the delete
 command
Date: Thu, 3 Aug 2017 15:06:21 -0700

tags 27916 + notabug
thanks

On Thu, Aug 3, 2017 at 2:00 AM, jean-christophe manciot
<actionmystique <at> gmail.com> wrote:
> You're right, my bad.

Marking as resolved/notabug in our tracker.

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