bugGNU Octave - Bugs: bug #50692, Command Window outputs spurious...


bug #50692: Command Window outputs spurious newline every 30 sec.

Submitted by:  None
Submitted on:  Fri 31 Mar 2017 04:30:25 PM UTC  
Category:  GUI Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  Need Info Assigned to:  None
Originator Name:  tcbrooke Originator Email:  -email is unavailable-
Open/Closed:  Closed Release:  4.2.1
Operating System:  Microsoft Windows

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Thu 21 Mar 2019 12:34:04 AM UTC, comment #9:

I confirmed that both 5.1.0-w64 and 4.4.1-w64 still have this problem on my Windows7 computer.

I have tried re-installing Octave and have not loaded any OF packages. But this problem did not go away - very annoying.

It will be greatly appreciated if you can fix this problem.

Auto Tiger <autotiger>
Sun 10 Mar 2019 06:51:56 PM UTC, comment #8:

No response, asumming this has been fixed in the latest release. Closing report.

Rik <rik5>
Project Administrator
Sun 03 Mar 2019 06:25:23 AM UTC, comment #7:

Version 4.4.1 is deprecated and no longer supported. Please try with the latest stable release which is 5.1.0. The problem is likely to have been fixed.

Rik <rik5>
Project Administrator
Thu 24 Jan 2019 04:25:24 PM UTC, comment #6:

I can't reproduce the problem with 4.4.1 and Windows 7 running in a virtualbox vm.

This sounds like a readline input event hook function is somehow installed and that it is displaying a newline character, except in that case it should happen every 0.1 seconds. I have no idea what would write a newline every 30 seconds.

John W. Eaton <jwe>
Project Administrator
Thu 24 Jan 2019 03:23:21 PM UTC, comment #5:

The problem is still present in 4.4.1 on Windows 7 64 bits.

Mon 20 Nov 2017 11:15:09 AM UTC, comment #4:

I have exactly the same problem, no chance of turning that off.
Tried a lot the last few months, nothing worked.
Only use it with CLI now.

Stefan <thehighendoflow>
Wed 28 Jun 2017 10:36:07 PM UTC, comment #3:

This behavior has been confirmed by an independent reporter using Windows 7 (see bug #51301). Still lacking reproducibility or explanation.

Mike Miller <mtmiller>
Project Administrator
Tue 04 Apr 2017 05:15:11 PM UTC, comment #2:

After reinstalling Octave: still does it.

No OF packages loaded.
Just start "Octave (GUI)" and click things.
However, it's my understanding that some packages are loaded implicitly (e.g., general and miscellaneous). Here's my path immediately after startup:

p = .;C:\Octave\OCTAVE~1.1\lib\octave\4.2.1\site\oct\x86_64-w64-mingw32;C:\Octave\OCTAVE~1.1\lib\octave\site\oct\

It still does it after closing/showing the Command Window, and/or the File Browser, and/or the Workspace, and/or the Command History panes.

During installation, Octave reported that it couldn't find a JRE. There is a JRE installed, and on the path, but the items on the path are symlinks. I could not find a way to tell Octave where to look specifically.

During installation, I selected the [default] "OpenBLAS" library.

No idea if any of that matters.

Mon 03 Apr 2017 08:41:40 PM UTC, comment #1:

I tried your examples in Octave-4.3.0+ (dev version) but I cannot reproduce your issues.
The sort of problems you describe are often fairly hard to reproduce anyway.
Windows 10 with all its silent if not stealth updates / upgrades is a bit of a moving target - that already broke some of my hardware drivers (reason for me to stick with Win 7 as much as I can).

Have you tried re-installing Octave?
Did you have any OF packages loaded (using the "pkg load <list of packages>" command?
Have you experimented with showing / hiding panes?
(sorry for all those questions but you seem to be able to reproduce, so you're the one best suited to discover some sort of pattern or consistent behavior)

Philip Nienhuis <philipnienhuis>
Project Member
Fri 31 Mar 2017 04:30:25 PM UTC, original submission:

Some commands/actions cause the Command Window to output a newline every 30 seconds or so. Even when in the middle of entering a command.

Once it starts, there does not seem to be any way to stop it.

Things which seem to cause it to happen:

  • Expand a directory (the '+' icon) in the File Browser panel.
  • Select a recent directory from the File Browser current working directory choice/drop-down/combo-box control
  • Double-click a directory in the File Browser panel.

Things which don't seem to cause it to happen:

  • Scroll the list of files/directories in the File Browser panel.
  • Show the drop-down list of recent directories (without selecting one)
  • Select (single-click) a directory in the File Browser panel.

Additionally, some commands seem to trigger the problem fairly reliably -- but not universally:

  • 'cd Someplace' (no quotes)
  • 'cd ".."'

Others do not:

  • 'cd "Someplace"' (with quotes)

Clearing the command window does NOT stop the periodic newlines.

Unchecking the preference "Synchronize Octave Working Directory with file browser" does not stop the periodic newlines, nor does it prevent them from happening in the first place.


Windows10 (yes, I realize this is still experimental)

GNU Octave, version 4.2.1
Octave was configured for "x86_64-w64-mingw32".

Installed from "octave-4.2.1-w64-installer.exe"

Invoked from "Octave (GUI)" choice on Start menu



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  • -email is unavailable- added by autotiger (Posted a comment)
  • -email is unavailable- added by rik5 (Posted a comment)
  • -email is unavailable- added by jwe (Posted a comment)
  • -email is unavailable- added by thehighendoflow (Posted a comment)
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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-03-10 rik5 Open/ClosedOpen => Closed
    2019-01-24 mtmiller Carbon-CopyRemoved 80942 => -
    2017-07-12 mmuetzel Dependencies- => bugs #51446 is dependent
    2017-06-28 mtmiller StatusNone => Need Info
    2017-06-23 mtmiller Dependencies- => bugs #51301 is dependent

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