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SSH no password connection: ssh -XYC olga@pktloginNOSPAMPLEASE.phy.tu-dresden.de

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origin --> http://www.linuxproblem.org/art_9.html

How to do it:
First log in on A as user a and generate a pair of authentication keys. Do not enter a passphrase:
a@A:~> ssh-keygen -t rsa

Generating public/private rsa key pair.
Enter file in which to save the key (/home/a/.ssh/id_rsa):
Created directory '/home/a/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/a/.ssh/id_rsa.
Your public key has been saved in /home/a/.ssh/id_rsa.pub.
The key fingerprint is:
3e:4f:05:79:3a:9f:96:7c:3b:ad:e9:58:37:bc:37:e4 a@A

Now use ssh to create a directory ~/.ssh as user b on B. (The directory may already exist, which is fine):

a@A:~> ssh b@B mkdir -p .ssh
b@B's password:

Finally append a's new public key to b@B:.ssh/authorized_keys and enter b's password one last time:

a@A:~> cat .ssh/id_rsa.pub | ssh b@B 'cat >> .ssh/authorized_keys'
b@B's password:

From now on you can log into B as b from A as a without password:

a@A:~> ssh b@B

A note from one of our readers: Depending on your version of SSH you might also have to do the following changes:

Put the public key in .ssh/authorized_keys2
Change the permissions of .ssh to 700
Change the permissions of .ssh/authorized_keys2 to 640

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New location of working analysis:

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/home/olga/IKTP/HiLum/ROOTStuff/try/bin

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git instructions

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sudo apt-get install git git-gui

emacs .gitignore

git init

git status

git add src cmake CMakeLists.txt

git status

to delete: rm -rf CMakeFiles -r

emacs .gitignore

To commit: git commit

git config --global user.email olga.novgorodova@tu-dresdenNOSPAMPLEASE.de

git config --global user.name olga

git commit

GUI vertion: gitk

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changed for printing - to bring it back for IKTP printing.

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sudo emacs -nw client.conf

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Mounted IKTP windomain:

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olga@olga-ThinkPad-T410s:~$ sudo mount -t cifs //windomain.iktp.tu-dresden.de/e-labor/ /home/olga/E-Labor -o username=olga

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Synchronize data from laptop to CERN:

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rsync -a . olga@lxplusNOSPAMPLEASE.cern.ch:/afs/cern.ch/work/o/olga/TB_Protvino_rsync/try

rsync -a . /media/TRANSCEND/IKTP/ROOTStuff/try/.

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How to: Double vector in ROOT *

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/media/KINGSTON/IKTP/Hits_tree/klass.c (h) is here

If you have such declaration in header file:

vector<vector > *hittile_energy;

If you try to print it out do rereferencing of the vector:

for (Long64_t jentry=0; jentry<10;jentry++) {

Long64_t ientry = LoadTree(jentry);

if (ientry < 0) break;

nb = fChain->GetEntry(jentry); nbytes += nb;

std::cout << "entry: " << jentry << std::endl;

std::cout << "i-size: " << hittile_energy->size() << " " << std::endl;

for (size_t i =0; i < hittile_energy->size(); ++i) {

std::cout << "j-size: " << (*hittile_energy)[i].size() << " " << std::flush;

for (size_t j =0; j < (*hittile_energy)[i].size(); ++j) {

std::cout << "["<<i<<";"<<j<<"]=" << (*hittile_energy)[i][j] << "GeV @" << (*hittile_eta)[i][j] << "," << (*hittile_phi)[i][j] << "," << (*hittile_side)[i][j] << "sample" << (*hittile_sample)[i][j] << " " << std::flush;

}

std::cout << std::endl;

}

std::cout << std::endl;

}

For header file input after includes:

#ifdef MAKECINT

#pragma link C++ class vector<vector >+;

#pragma link C++ class vector<vector >+;

#endif

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How to fix fit function "resolution"

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fit_function->SetNpx(5000);

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How to connect to E-labor

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less /etc/passwd | grep olga

less /etc/group | grep olga

sudo mkdir E-Labor

sudo mount -tcifs //windomain.iktp.tu-dresden.de/IKTP$/E-Labor /home/E-labor -o username=olga,uid=1000,gid=1000

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How to configure a CERN printer // ubuntu Scientific Linux (4,5)

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I successfully configure the printer near by our office (40-rd-hpcor) in buntu using CUPS.

CERN

open a webbrowser

goto localhost:631

goto administration

choose "add printer" (or something similar depending on your cups-version and language settings)

choose "other network printers (...) LPD"

lpd://12-1-cor.print.cern.ch/12-1-cor (replace 12-1-cor appropriately for other printers)

the rest is straight forward … choosing the driver you might have several good-looking options … try out what's best (or ask aunt G)

for 12-1-cor I recommend (and tested) the driver which is also recommended in cups. for debian it is installed with the hplip package

change the printersettings to tell cups that a duplex unit is installed

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Print in DESY or TU Dresden

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create or correct next file as root :

sudo emacs /etc/cups/client.conf

#for TU Dresden IKTP

ServerName 141.30.85.67

#for DESY HH

cups-hep.desy.de

restart cups service:

sudo /etc/init.d/cups restart

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Unexplained Segmentation fault

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In case of work with arrays - sometimes memory used have to be increased by next command:

ulimit -s 500000

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cc| | | | | | | |

[largrod4] /home/rod4[largrod4] /home/rod4 > /sbin/route -n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.3.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1

192.168.123.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1

0.0.0.0 192.168.3.1 0.0.0.0 UG 0 0 0 eth1

> /sbin/route -n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.3.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1

192.168.123.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1

0.0.0.0 192.168.3.1 0.0.0.0 UG 0 0 0 eth1

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Fingerabdruckleser Fingerprint GUI (libfprint)

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Auf der Seite des Fingerprint GUI PPA ist eine Liste der unterstützten Leser zu finden. Bei der Identifikation des eingebauten Lesers hilft der Befehl

lsusb

Zu installieren sind folgende Pakete aus dem Fingerprint GUI PPA:

libbsapi

policykit-1-fingerprint-gui

fingerprint-gui

sudo add-apt-repository ppa:fingerprint/fingerprint-gui

sudo apt-get update

sudo apt-get install libbsapi policykit-1-fingerprint-gui fingerprint-gui

Wichtig: zur Deinstallation bitte unbedingt die Hinweise auf der PPA-Seite beachten!

Technische Details finden sich über die Projektseite bzw. im Step-by-Step- Manual. Die Benutzung ist im User Manual beschrieben.

Sollte man beim Registrieren eines Fingers in einer "Scan Loop" landen und einen Fingerprint Reader von Upek mit der USB ID 147e:2020 verwenden (z.B. im T530 verbaut), dann kann es nötig sein, zu den oben genannten Schritten noch ein weiteres Repository einzubinden, das eine dafür angepasste libbsapi enthält:

sudo add-apt-repository ppa:fingerprint/fingerprint-gui-experimental

sudo apt-get update

sudo apt-get upgrade

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* Emacs triks for formatting *

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Emacs - remove rectangle - CtrlX - r k

Add in some rectangle shape - CtrlX r t and type what to put inside.

To format all spaces and tabs in emacs - !!!! - CtrlX h --> will select all --> then press CtrlAlt Tab

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* *

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ssh olga@lxplusNOSPAMPLEASE.cern.ch vncserver -geometry 1920x1150 :3

on the laptop itself:

vncviewer -via lxplus.cern.ch lxplus0219:3

or this geometry --> -geometry 1350x700

install: TightVNC

vncviewer --help

TUDresden grid certificate:

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• 28.08.2013 How to set network though the gateway

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/etc/resolv.conf - search desy.de nameserver 131.169.40.200 nameserver 131.169.194.200

/sbin/route

sudo /sbin/route del default gw ...... sudo /sbin/route add default gw 192.168.4.251

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• 22.08.2013 How to send programm in backup

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here are two examples:

a) nohup ./program > out 2>&1 &

b)program > out 2>&1

^z

jobs

disown %

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• 22.08.2013 Solved problem with space on windows7 at lenovo TUD computer

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There was "RRBackup" folder in the /media/sda2 drive - corresponding to the C: disc it keeps the backup of 26 Gb hidden from the user. In the save mode one can see this folder, but it is locked even for administrator and you can not see files and to delete. Ubuntu did not start on lenovo. We opened knoppix and deleted this folder by command:

>rm -rf RRbackups

Now I have 36 Gb free. Restarting of computer showed no difference in work on the PC up to now. 20Gb was cut from the disk and converted to extendable disk and ubuntu was installed without problem over it.

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• 19.08.2013 Solved problem with emacs in ubuntu

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After lookin in the internet found easy and good solution, which involved creating the file ~/.Xdefaults with the line

Code:

emacs*font: 7x14

and then running

Code:

xrdb -merge ~/.Xdefaults

I tried it in the ssh directly and in my own laptop plus I put the last command to .bashrc - works.

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TUD Latex Presentations

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To make latax presentation I downloaded beamer from - http://tu-dresden.de/service/publizieren/cd/4_latex/index.html

I saved it in the Desktop/TUD_latex folder, changed file bspBeamer.tex and to create the dvi file just run latex over this file. The output file I just converted to pdf and watched, I got the pdf of the presentation in TUD style. I have to keep it like this.