The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Linux’ Category

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Dieses sudo-Gehampel unter Debian/Ubuntu nervt. Aber es gibt Abhilfe: alias…

Posted by jpluimers on 2018/12/24

[WayBack] Dieses sudo-Gehampel unter Debian/Ubuntu nervt. Aber es gibt Abhilfe: alias iddqd=’sudo su -‘ – Kristian Köhntopp – Google+

Or maybe this:

iddqd='sudo -i'

–jeroen

PS: “sudo su -” vs “sudo -i”

 

Posted in *nix, Linux, Power User | Leave a Comment »

Reptyr – Forgot to “screen” your ssh session first, and now that long running…

Posted by jpluimers on 2018/12/24

From a while back, but still so cool! It allows you to “recover” the terminal (stdin/stdout/stderr) of a process that was attached to a terminal or ssh session.

Reptyr – Forgot to “screen” your ssh session first, and now that long running thing is stuck?

»reptyr PID will grab the process with id PID and attach it to your current terminal.«

server:~ # zypper install reptyr
...
Retrieving: reptyr-0.3dev_git20120325-7.1.2.x86_64.rpm ...................[done]
(1/1) Installing: reptyr-0.3dev_git20120325-7.1.2 ........................[done]
server:~ # rpm -qi reptyr
...
Summary     : A tool for "re-ptying" programs
Description :
reptyr is a utility for taking an existing running program and
attaching it to a new terminal. Started a long-running process over
ssh, but have to leave and don't want to interrupt it? Just start a
screen, use reptyr to grab it, and then kill the ssh session and head
on home.
Distribution: openSUSE 13.1

Source: [WayBack] Reptyr – Forgot to “screen” your ssh session first, and now that long running thing is stuck?… – Kristian Köhntopp – Google+

It works with tmux too and is supported on many Linux distributions, see for instance [WayBack] Reptyr – Move A Running Process From One Terminal To Another Without Closing It – OSTechNix.

You can even redirect a pty for gdb usage: [WayBack] reptyr(1): new terminal – Linux man page

StackExchange thread: [WayBack] How to recover a shell after a disconnection with these entries:

Originally from 2011 [WayBack] reptyr: Attach a running process to a new terminal – Made of Bugs it is still maintained:

GitHub repository [WayBack] nelhage/reptyr: Reparent a running program to a new terminal

–jeroen

Posted in *nix, *nix-tools, Linux, openSuSE, Power User, screen, SuSE Linux, tmux | Leave a Comment »

linux – Is there a way to remove “Last message repeated x times” from logs? – Server Fault

Posted by jpluimers on 2018/12/17

One day I will need to enable repeating those messages: [WayBack] linux – Is there a way to remove “Last message repeated x times” from logs? – Server Fault

–jeroen

Posted in *nix, *nix-tools, Linux, Power User | Leave a Comment »

Links for Nagios openSuSE Tumbleweed monitoring (including Android devices)

Posted by jpluimers on 2018/12/13

For my link archive:

Non-stable repos:

–jeroen

Posted in *nix, Linux, Monitoring, Nagios, openSuSE, Power User, SuSE Linux, Tumbleweed | Leave a Comment »

listing files with ISO 8601 time stamps on *n*x flavours

Posted by jpluimers on 2018/12/05

A (long!) while ago, I wrote about list date with seconds from ls command – Dev Shed that showed how to list the full ISO timestamp (including seconds) of files.

This is an update.

The previous post showed that you could use this statement to list all files with their full ISO timestamps (and therefore get both the seconds and milliseconds) on (open)SuSE Linux, Mac OS X and Cygwin:

ls -l --time-style=full-iso

What Linux and displaying dates in ISO 8601 format… : Little Green Delusions proposes are two solutions to make this more permanent:

alias ls='ls -l --time-style=long-iso'

or edit one of your profile files (he prefers /etc/profile.local, but that is system wide, so I usually prefer ~/.bash_profile) to add this line:

export TIME_STYLE=long-iso

The thing is: I do not always want to have ls -l show ISO 8601 dates. I like the way that ls-l lists timestamps for very old or future files:                 Read the rest of this entry »

Posted in *nix, Linux, openSuSE, Power User, SuSE Linux | Leave a Comment »

how can I free up space on /boot as “openSUSE-2014-462” fails to install on openSUSE 12.3 x86_64

Posted by jpluimers on 2018/11/30

From a long time ago:

[WayBack] how can I free up space on /boot as “openSUSE-2014-462” fails to install on openSUSE 12.3 (x86_64):

Installation of kernel-desktop-3.7.10-1.40.1 failed:
(with --nodeps --force) Error: Subprocess failed. Error: RPM failed:     installing package kernel-desktop-3.7.10-1.40.1.x86_64 needs 16MB on the /boot filesystem

Based on that thread, I figured out the steps:

Read the rest of this entry »

Posted in *nix, Linux, openSuSE, Power User, SuSE Linux | Leave a Comment »

SSH: Connection Reset by Peer – Server Fault

Posted by jpluimers on 2018/11/22

One occasion I had SSH throw a Connection Reset by Peer on my when was the SD-card of a Raspberry Pi started failing and the ext4 filesystem got mounted in read-only mode.

Then sshd was still listening on port 22, but since it could not write to disk any more, it threw a Connection Reset by Peer to the client.

It was on OpenSuSE Tumbleweed, but would failed just as well using Raspbian.

Lessons learned:

  • IoT hardware will fail.
  • ext4 breaks when the hardware breaks.

–jeroen

Reference:

Posted in *nix, *nix-tools, Debian, Development, Hardware Development, IoT Internet of Things, Linux, Network-and-equipment, openSuSE, Power User, Raspberry Pi, Raspbian, SuSE Linux, Tumbleweed | Leave a Comment »

Install on openSUSE / SLES – Zabbix.org

Posted by jpluimers on 2018/10/29

Interesting: [Archive.is] Install on openSUSE / SLES – Zabbix.org is possible and there are packages for this on the OpenSuSE site itself for the various kinds of distributions.

For instance, Tumbleweed is at http://download.opensuse.org/repositories/server:/monitoring/openSUSE_Tumbleweed/

Good introductions on Zabbix are via [WayBack] Stephen Fritz on Systems Engineering: Installing and Configuring Basic Zabbix Functionality on Debian Wheezy who has a [Archive.is] zabbix tag.

Other links are at Welcome to workaround.org – tips around open source and Linux stuff.

And there is www.zabbix.com/documentation

–jeroen

Posted in *nix, Linux, openSuSE, Power User, SuSE Linux, Tumbleweed | Leave a Comment »

MotionEyeOS on Odroid C1+ with Logitech USB web cameras

Posted by jpluimers on 2018/10/11

Hopefully I get this to work after fixing

The first part of the fix was to

  1. re-image the SD card.
  2. boot
  3. wait 5 minutes (there is no output on HDMI apart from some flickering and no output on TTY using 115200 bits/second despite trying [WayBack] en:c1_hardware_uart [ODROID Wiki])

The second part is getting the USB web cameras to work.

I’ve got two types, but the label on them doesn’t list their common name, only their P/N sometimes with M/N:

  1. P/N 860-000049 M/N V-UBC40 (really old USB cameras)
  2. P/N 860-000334 (new USB camera)

The MotionEyeOS web interface didn’t list any working cameras so I had to do some digging.

Luckily [WayBack] Webcam software and driver support for Windows has a table of part and model numbers combined with product names, so they got revealed them as these:

  1. P/N 860-000334 = M/N V-U0028  with name HD Pro Webcam C920
  2. P/N 861225 = M/N V-UBC40 with name Quick Cam Messenger
    (which is funny as the P/N on the label is different)

Both are supported by motion according to [WayBack] Logitech < Motion < Foswiki though the Quick Cam Messenger needs [WayBack] Quickcam Messenger & Communicate driver for Linux which I should try to cross-compile one day.

The latter works fine. Below are some settings I used.

Read the rest of this entry »

Posted in *nix, Development, Hardware Development, Linux, Odroid, Power User | Leave a Comment »

Notes on recording audio calls from a Fritz!Box and playing back those captures calls

Posted by jpluimers on 2018/09/28

A while ago, I documented some links for In case I ever need to record calls on my Fritz!Box devices.

By now, I’ve done a bit more investigation: I’ve enabled the call monitor, did some port scans, installed domoticz and got deeper into fritzcap.

Oh and I got packet capturing to work too: Fritz!Box – capture network packets in Wireshark format or ISDN in dtrace format.

A small recap so I don’t forget what I did and what the effects were.

Enabling CallMonitor

[WayBack] Fritzbox – Domoticz showed how to enable the CallMonitor option in your Fritz!Box

  • Dial #96*5* to enable (response “CallMonitor On”)
  • Dial #96*4* to disable (response “CallMonitor Off”)
  • It seems not possible to ask for the current state (enabled/disabled)
  • After it is enabled, the TCP port 1012 on your Fritz!Box is available for tools like [WayBack] Domoticz and fritzcap.

Read the rest of this entry »

Posted in *nix, Fritz!, Fritz!Box, Internet, Linux, openSuSE, Power User, SuSE Linux | Leave a Comment »

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