From bug-request at octave dot org Tue Mar 29 14:39:02 2005
Subject: Re: Option -H is ignored on GNU Octave, version 2.1.57
From: Luiz Angelo Daros de Luca <luizd at inf dot ufsc dot br>
To: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
Cc: bug at octave dot org
Date: Tue, 29 Mar 2005 14:31:29 -0600

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So, now its OCTAVE_HISTFILE that doesn't work :-)=20
OCTAVE_HISTSIZE is ok

# export OCTAVE_HISTFILE=3D/tmp/test
# export OCTAVE_HISTSIZE=3D123
# octave
GNU Octave, version 2.1.57 (x86_64-mandrake-linux-gnu).
Copyright (C) 2004 John W. Eaton.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTIBILITY or
=46ITNESS FOR A PARTICULAR PURPOSE.  For details, type `warranty'.

Additional information about Octave is available at http://www.octave.org.

Please contribute if you find this software useful.
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Report bugs to <bug-octave at bevo dot che dot wisc dot edu> (but first, please read
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octave:1> history_file
history_file =3D /root/.octave_hist
octave:2> history_size
history_size =3D 123


Em Ter 29 Mar 2005 14:58, John W. Eaton escreveu:
> On 29-Mar-2005, Luiz Angelo Daros de Luca <luizd at inf dot ufsc dot br> wrote:
> |  According to its help, the option -H or -- avoids octave to save its
> | history file. But even using it, it still writes in the file.
> |
> | # octave --help
> | GNU Octave, version 2.1.57 (x86_64-mandrake-linux-gnu).
> | Copyright (C) 2004 John W. Eaton.
> | (...)
> |   --no-history, -H        Don't save commands to the history list
> | (..)
>
> Perhaps the wording could be better.  This just means that Octave will
> not add commands to the history list, not that it won't try to write
> the contents of the list when it exits.  When I start Octave with -H,
> the history list does not grow and the contents of the history file
> are unchanged after exiting, so I think this option is working
> properly.
>
> Starting Octave with -H sets the initial value of the built-in
> variable "saving_history" to false.  You can later change that to
> true, then back to false, so when Octave exits, it is not sufficient
> to simply check the value of "saving_history" and not write the
> history file if the value is false.
>
> If you want to avoid touching the history file when Octave exits, then
> set the built-in variable history_file to "/dev/null".
>
> It might be nice if the readline library did not write to the history
> file if the history list has not changed, but it might not be a
> trivial change.  I can think of a number of sticky problems associated
> with trying to get this right.  For example, in addition to noting a
> change in the history list, you will have to keep track of the file
> that was used to initialize the list and only skip writing if there
> have been no changes to the list and the file used for writing is the
> same as the file used for reading.  If you want this feature, then I
> suggest submitting a patch for readline.
>
> jwe

=2D-=20
      Luiz Angelo Daros de Luca
          luizd at inf dot ufsc dot br
           ICQ : 19290419

 I Know, "Where you wanted to go today",
    but I decided to stop here instead!
                        MS Windows=20


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