debug1: An invalid name was supplied Cannot determine realm for numeric host address

If you have a slow SSH connection to a server with the following message :

debug1: An invalid name was supplied
Cannot determine realm for numeric host address

Make sure that the server you try to reach has a well-configured reverse DNS. Then, you can desactivate GSSAPI authentication by adding the following line to your ssh client configuration file :

fool@localhost:~$echo “GSSAPIAuthentication no” >> $HOME/.ssh/config

You should be able to connect to your server through SSH quicker.

 

Use Pidgin SIPE plugin on Windows 7

It is possible to replace your Microsoft Lync client by a free IM client : Pidgin with a special enabled-plugin : SIPE

To download the latest win32 Pidgin version :

Pidgin 2.10.3

Download the SIPE plugin compiled for Windows :

SIPE

Then, install your new IM client by launching the installer. Do the same for the SIPE client. Now, add your Lync account into Pidgin by providing the following information :

Protocol : Office Communicator

Username : your professional email address

Login user : your_firm_Active_Directory_domain_name\your_windows_login_name

and that’s all. For your first connection, you will be asked to enter your AD password and probably to accept some security certificates. No further configuration needed. It should work out of the box.

MySQL : Listing the system and object privileges for a given user

If your are connected as root on your MySQL database, you can list all the system and object privileges for a given user :

mysql> show grants for user ‘fool’@'localhost’;

or if you are connected as the user fool :

mysql> show grants;

mysql> show grants for current_user;

mysql> show grants for current_user();

current_user function is available if your MySQL version is equal or higher that 5.0

Installing Debian packages with debtags

You can make searches for package(s) through apt-cache and other GUI related tools. Debtags provides a different way to do the same kind of job : debtags

To install it :

root@localhost:~#apt-get install debtags

To populate the debtags database with the latest up-to-date data, you should remove the “#” at the line beginning with “tags http://debtags.alioth.debian.org/tags/”.  You can launch the database update :

root@localhost:~# debtags update

Most of the packages available in the Debian repositories have tags inside their description. See below what an apt-cache show provides as information for the vim package.

root@localhost:~# apt-cache show vim
Package: vim
Priority: optional
Section: editors
Installed-Size: 1744
Maintainer: Debian Vim Maintainers <pkg-vim-maintainers@lists.alioth.debian.org>
Architecture: amd64
Version: 2:7.2.445+hg~cb94c42c0e1a-1
Provides: editor
Depends: vim-common (= 2:7.2.445+hg~cb94c42c0e1a-1), vim-runtime (= 2:7.2.445+hg~cb94c42c0e1a-1), libacl1 (>= 2.2.11-1), libc6 (>= 2.7), libgpm2 (>= 1.20.4), libncurses5 (>= 5.7+20100313), libselinux1 (>= 1.32)
Suggests: ctags, vim-doc, vim-scripts
Filename: pool/main/v/vim/vim_7.2.445+hg~cb94c42c0e1a-1_amd64.deb
Size: 915008
MD5sum: dab2644b07e8dea570fc020d59f69d41
SHA1: 8314d6388d378a8994e94d224255ef5b447851a8
SHA256: 22c28c136a0c761cdc19a299b7cd9b8adb00e9de7e66b787c945f2104cfdba9d
Description: Vi IMproved – enhanced vi editor
Vim is an almost compatible version of the UNIX editor Vi.
.
Many new features have been added: multi level undo, syntax
highlighting, command line history, on-line help, filename
completion, block operations, folding, Unicode support, etc.
.
This package contains a version of vim compiled with a rather
standard set of features.  This package does not provide a GUI
version of Vim.  See the other vim-* packages if you need more
(or less).
Homepage: http://www.vim.org/
Tag: devel::editor, implemented-in::c, interface::text-mode, role::program, scope::application, uitoolkit::ncurses, use::editing, works-with::text, works-with::unicode

Here is a couple of commands to deal with this kind of search. You do not need to be root to run these commands.

fool@localhost:~$ debtags show vim

With this command above, you get all the tags within the vim package. This is similar to apt-cache show.

If you want to list all the packages available in the repositories with the “devel::editor” tag :

fool@localhost:~$ debtags search devel::editor

cream – VIM macros that make the VIM easier to use for beginners
csstidy – CSS parser and optimiser
drpython – simple and customizable editor for the Python language
eclipse-jdt – Eclipse Java Development Tools (JDT)
editra – simple multi-platform text editor
eieio – Enhanced Implementation of Emacs Interpreted Objects
elvis – powerful clone of the vi/ex text editor (with X11 support)
elvis-common – common files for elvis, elvis-console and elvis-tools
elvis-console – powerful clone of the vi/ex text editor (without X11 support)
elvis-tiny – Tiny vi compatible editor for the base system
elvis-tools – text editing tools for programmers (elvfmt, elvtags, ref)
emacs – The GNU Emacs editor (metapackage)
emacs-goodies-el – Miscellaneous add-ons for Emacs
emacs-intl-fonts – Fonts to allow multi-lingual PostScript printing from Emacs
emacs23 – The GNU Emacs editor (with GTK+ user interface)
emacs23-bin-common – The GNU Emacs editor’s shared, architecture dependent files
emacs23-common – The GNU Emacs editor’s shared, architecture independent infrastructure
emacs23-nox – The GNU Emacs editor (without X support)
emacsen-common – Common facilities for all emacsen
eric – full featured Python IDE
fte – Text editor for programmers – base package
fte-console – Text editor for programmers – console edition, no I18N support
fte-docs – Documentation and examples for the FTE editor
fte-terminal – Text editor for programmers – version for terminals
fte-xwindow – Text editor for programmers – X Window System edition with I18N support
gphpedit – development environment for PHP/HTML/CSS
haskell-mode – A major mode for editing Haskell in Emacs
infon-devel – Develop bots for the infon game
jed – editor for programmers (textmode version)
jed-common – S-Lang runtime files for jed and xjed
jed-extra – collection of useful Jed modes and utilities
jove – Jonathan’s Own Version of Emacs – a compact, powerful editor
js2-mode – Emacs mode for editing Javascript programs
jvim-canna – Japanized VIM (Canna version)
kate – K Advanced Text Editor
kobby – Collaborative text editor for KDE
kwrite – simple graphical text editor
lpe – Lightweight Programmer’s Editor
medit – A useful programming and around-programming text editor
monodevelop – Development Environment for GNOME
monodevelop-java – Java plugin for MonoDevelop
nvi – 4.4BSD re-implementation of vi
padre – Perl Application Development and Refactoring Environment
pida – Python Integrated Development Application, a Python IDE
plt-scheme – PLT Scheme Programming Environment
projectmanager.app – Simple IDE for GNUstep
pype – Python programmers editor
pyragua – Very lightweight Python editor
rkward – a KDE frontend to the R statistics language
scite – Lightweight GTK-based Programming Editor
vigor – nvi with the evil paperclip
vile – VI Like Emacs – vi work-alike
vile-common – VI Like Emacs – support files for vile/xvile
vile-filters – VI Like Emacs – highlighting filters for vile/xvile
vim – Vi IMproved – enhanced vi editor
vim-common – Vi IMproved – Common files
vim-gnome – Vi IMproved – enhanced vi editor – with GNOME2 GUI
vim-gtk – Vi IMproved – enhanced vi editor – with GTK2 GUI
vim-latexsuite – view, edit and compile LaTeX documents from within Vim
vim-lesstif – Vi IMproved – enhanced vi editor – with LessTif GUI
vim-nox – Vi IMproved – enhanced vi editor
vim-runtime – Vi IMproved – Runtime files
vim-scripts – plugins for vim, adding bells and whistles
vim-tiny – Vi IMproved – enhanced vi editor – compact version
vim-vimoutliner – script for building an outline editor on top of Vim
vimhelp-de – Vi IMproved – Documentation files (German translation)
wily – A work-alike of the Acme programming environment for Plan 9
wims – server for educative contents as courses, exercises, exams
xemacs21 – highly customizable text editor
xemacs21-basesupport – Editor and kitchen sink — compiled elisp support files
xemacs21-basesupport-el – Editor and kitchen sink — source elisp support files
xemacs21-bin – highly customizable text editor — support binaries
xemacs21-gnome-mule – highly customizable text editor — transitional package
xemacs21-gnome-mule-canna-wnn – highly customizable text editor — transitional package
xemacs21-gnome-nomule – highly customizable text editor — transitional package
xemacs21-mule – highly customizable text editor — Mule binary
xemacs21-mule-canna-wnn – highly customizable text editor — Mule binary compiled with Canna and Wnn
xemacs21-mulesupport – Editor and kitchen sink — Mule elisp support files
xemacs21-mulesupport-el – Editor and kitchen sink — source elisp support files
xemacs21-nomule – highly customizable text editor — Non-mule binary
xemacs21-support – highly customizable text editor — architecture independent support files
xemacs21-supportel – highly customizable text editor — non-required library files
xjed – editor for programmers (x11 version)
xvile – VI Like Emacs – vi work-alike (X11)

Then, you can install one of them with the apt-get program.

To find which tags have been created for a particular subject :

fool@localhost:~$debtags tagsearch perl

devel::lang:perl – Perl Development
implemented-in::perl – Perl

More info in the debtags manpage : man (1) debtags

passwd authentication token manipulation error

If you try to reinitialize the root passwd of your Linux installation through a recovering boot with init=/bin/sh, you may have  the following error message :

passwd: Authentication token manipulation error

First check if your / filesystem is mounted read-write or read-only. Restart your machine and at the Grub prompt (tested on a fresh install of RHEL 6.2 with Grub version of 0.97), change ro to rw as indicated below :

kernel /vmlinuz-2.6.32-220.el6-x86_64 ro root=/dev/mapper….

kernel /vmlinuz-2.6.32-220.el6-x86_64 rw root=/dev/mapper….

 

An other solution is to make sure that the content of /etc/passwd and /etc/shadow are  the same with the pwconv command.

As root, before reinitializing again its passwd, run the command below :

root@localhost:~# pwconv

Then

root@localhost~# passwd

You should have no more error message.