Linux Remote Desktop

sudo apt-get update
sudo apt-get install xrdp 

#desktop

sudo apt-get install mate-core mate-desktop-environment mate-notification-daemon

#setting session

sudo sed -i.bak '/fi/a #xrdp multiple users configuration \n mate-session \n' /etc/xrdp/startwm.sh

#firewall

sudo ufw allow 3389/tcp

#Use remmina desktop to connect

Extra

service --status-all

printf 'Desktop: %s\nSession: %s\n' "$XDG_CURRENT_DESKTOP" "$GDMSESSION"

References:
[1] Setting xrdp https://medium.com/@vivekteega/how-to-setup-an-xrdp-server-on-ubuntu-18-04-89f7e205bd4e
[2] https://websiteforstudents.com/connect-to-ubuntu-16-04-17-10-18-04-desktop-via-remote-desktop-connection-rdp-with-xrdp/
[3] Print desktop name and session
https://askubuntu.com/questions/72549/how-to-determine-which-window-manager-is-running

SSH Skip port forwarding

Instant terminal sharing
https://tmate.io/


Share your UNIX terminal in seconds!
https://www.teleconsole.com/

Share local machine port to public access
https://serveo.net/
https://github.com/milio48/serveo
$wget https://raw.githubusercontent.com/milio48/serveo/master/serveo.sh 

$./serveo.sh tcp 5432 0

vs ngrok
Serveo is an excellent alternative to ngrok. Serveo was inspired by ngrok and attempts to serve many of the same purposes. The primary advantage of Serveo over ngrok is the use of your existing SSH client, so there's no client application to install.

Other slight advantages include preservation of URLs across reconnect for free (ngrok allows this only for paid accounts) and in-terminal request inspection and replay (ngrok uses a web interface).

vs OpenSSH

Using Serveo instead of OpenSSH frees you from having to configure and maintain a server. It also handles HTTPS and subdomain generation, two features that complicate a typical SSH port-forwarding setup.

Apache Guacamole is a clientless remote desktop gateway


http://guacamole.apache.org/


Manual mode (A like to connect to B)

PCA ----+----  PCB
            |
          PCX

Server Side (PCX Need root permission)

$sudo vi /etc/ssh/sshd_config

AllowTcpForwarding yes
GatewayPorts yes


$sudo firewall-cmd --add-port=7004/udp [--permanent]
$sudo firewall-cmd --add-port=7004/tcp [--permanent]

Target PCB

$ssh -f -N -R 7004:127.0.0.1:22 -l user_PCX -p port PCX(ip/domain name)
This means open port 7004 on PCX forwarding to port 22, PCX will start to listen on port 7004.

Source PCA
$ssh PCX(ip/domain name) -l user_PCB -p 7004

Enjoy!



References:
[1] https://rootsaid.com/ssh-without-port-forwarding/
[2] https://linuxhint.com/ssh-port-forwarding-linux/
[3] https://dev.to/samuyi/the-how-to-of-ssh-port-forwarding-1f4e

Course of Deep Learning

Resources:
[1] Cutting-Edge Trends in Deep Learning and Recognition http://slazebni.cs.illinois.edu/spring17/
[2] Course Deep Learning https://nthu-datalab.github.io/ml/
[3] Colab https://medium.com/deepquestai/train-object-detection-ai-with-6-lines-of-code-6d087063f6ff

Review documents

Resources:

[1] https://www.visaoerevisao.com
[2] https://www.editage.com.br
[3] http://www.nativeenglish.com.br/ (word)

Ubuntu route (s)

ip route list

route

route add -net 10.0.0.0 netmask 255.0.0.0 gw 10.169.5.1



sudo route del -net 192.168.76.0/24
and
sudo route del -net 192.168.76.0 netmask 255.255.255.0


References:
[1] https://www.cyberciti.biz/faq/linux-route-add/

mySql Optimize date queries and inserts

High Level of use



DROP INDEX VENTAS_fecven_idx ON VENTAS

select * from VENTAS where date(fecven)='2019-03-09' #~2.81

select * from VENTAS where fecven >='2019-03-09 00:00:00' and fecven<'2019-03-10 00:00:00'  #~2.9


select * from VENTAS where fecven Between '2019-03-09 00:00:00' and '2019-03-10 00:00:00'  #~3.6


CREATE INDEX VENTAS_fecven_idx ON VENTAS (fecven)


select * from VENTAS where date(fecven)='2019-03-09' #~2.794

select * from VENTAS where fecven >='2019-03-09 00:00:00' and fecven<'2019-03-10 00:00:00'  #~0.265

select * from VENTAS where fecven Between '2019-03-09 00:00:00' and '2019-03-10 00:00:00'  #~0.261

CREATE INDEX MOVPRO_fecmov_idx ON MOVPRO (fecmov)
#change date(fecmov) between f1 and f2
#to         fecmov between f1 and f2  #implicit add 00:00:00

DROP INDEX MOVPRO_fecmov_idx ON MOVPRO


Setting mysql

SET GLOBAL bulk_insert_buffer_size = 1024 * 1024 * 128;
[mysqld]
bulk_insert_buffer_size=128M

References
[1] Insert https://dev.mysql.com/doc/refman/8.0/en/insert-optimization.html
[2] Amazon Best Practices https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_BestPractices.html

Linux Discovery ports

Mac
sudo lsof -iTCP -sTCP:LISTEN


Linux
List used ports 
$netstat -tulpn | grep LISTEN

tcp        0      0 127.0.0.1:5939          0.0.0.0:*               LISTEN      -                  
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      -                  
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -                  
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -                  
tcp6       0      0 :::80                   :::*                    LISTEN      -                  
tcp6       0      0 :::22                   :::*                    LISTEN      -                  
tcp6       0      0 ::1:631                 :::*                    LISTEN      -

List process that using port
You like to knows who is using port 80, then

$sudo lsof -i :80
apache2   965     root    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13794 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13795 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13796 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13797 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13798 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)


Second option

$sudo netstat -peanut | grep ":80"
tcp6       0      0 :::80                   :::*                    LISTEN      0          26650      965/apache2

Setting apache
$vi /etc/apache2/apache2.conf

#       /etc/apache2/
#       |-- apache2.conf
#       |       `--  ports.conf
#       |-- mods-enabled
#       |       |-- *.load
#       |       `-- *.conf
#       |-- conf-enabled
#       |       `-- *.conf
#       `-- sites-enabled
#               `-- *.conf

PostgreSQL 8.4 en CentOS

1) Deshabilitar repositorios

#vi /etc/yum.repos.d/CentOS-Base.repo

agregar la siguiente linea a [base] y [updates]
exclude=postgresql*

2) Añadir los repositorios de PostgreSQL 8.4
Descargar el rpm apropiado desde http://yum.pgsqlrpms.org/reporpms/repoview/pgdg-centos.html

#wget http://yum.pgsqlrpms.org/reporpms/8.4/pgdg-centos-8.4-2.noarch.rpm
#rpm -ivh pgdg-centos-8.4-2.noarch.rpm (este archivos es el que descargamos)

3) Instalar PostgreSQL

3.1 verifique version
#yum list postgresql*

#yum install postgresql postgresql-server

3.1 Error probable de dependencia a apr-util
#yum install apr-util
#yum install postgresql postgresql-server

4) Arrancar el servidor y habilitar conexiones remotas

#service postgresql initdb
#service postgresql start

5) Configurar Accesos en /var/lib/pgsql/data/
5.1 pg_hba.conf
host all all 0.0.0.0/0 trust   #no need password , use md5
5.2 postgresql.conf
listen_addresses='*'
port=5432
max_connections=100
superuser_reserved_connections=5

6) Reinicia servicio
#/etc/init.d/postgresql restart


Referencias
[0] Postgres 9.1 http://wiki.postgresql.org/wiki/YUM_Installation
[1] Auto Start/Stop http://www.michaelhinds.com/tech/linux/install-postgres.html
[2] http://www.ixavi.com/2010/01/instalar-postgresql-8-3-en-centos-desde-yum/

Linux root password reset

Mode 1:Recover mode

In recover mode try to remount and after that change password

mount -o remount,rw /
 
Mode 2: Using live

mkdir /mnt/recover
mount /dev/sda2 /mnt/recover
 
chroot /mnt/recover
 
passwd  #or
passwd user 
exit
umount /mnt/recover

Other way : Using files(for root or any user)
 
 /etc/passwd
 /etc/shadow
  
root:x:0:0:root:/root:/bin/bash
to
root::0:0:root:/root:/bin/bash 

References:

[1] http://www.microhowto.info/howto/reset_a_forgotten_root_password_using_a_live_distribution.html

[2] https://www.computersecuritystudent.com/UNIX/UBUNTU/1204/lesson5/index.html

Epson Drivers

Resources:
[1]  https://goo.gl/4vrWdC

Raspberry Resources

DOSBox and rpi-x86 will play DOS games and run Win31/Win95.

QEMU can be used to emulate an x86 PC but performance will be terrible.

Wine will not work because it does not translate binary data, only Windows API calls, the binaries are still incompatible.

This is a difficult problem to solve which is probably why ExaGear charge money for it.

Resources:
[1] Chart comparison all famous Arm processors https://www.loverpi.com/blogs/news/85588545-raspberry-pi-banana-pi-orange-pi-odroid-differences-and-chart
[2] Odroid vs other https://tudosobreraspberry.info/2017/08/comparacao-raspberry-pi-orange-pi-banana-pi-e-odroid/

[3] Raspberry Pi3 vs UDOO x86 https://www.youtube.com/watch?v=dJkHxDjFuNA
[4] Combine qemu and wine for run Windows applications https://github.com/AlbrechtL/RPi-QEMU-x86-wine
[5] https://www.kickstarter.com/projects/udoo/udoo-x86-the-most-powerful-maker-board-ever/?src=soc
[6] https://www.raspberrypi.org/forums/viewtopic.php?t=189198

[7] https://elchapuzasinformatico.com/2016/04/udoo-x86-10-veces-mas-potente-raspberry-pi-3-79e/
[8] https://www.redeszone.net/2016/05/20/udoo-x86-mini-ordenador-10-veces-mas-potente-raspberry-pi-3/
[9] https://www.anandtech.com/show/11978/macom-sells-off-appliedmicros-xgene-cpu-business
[1] Experimental comparison Raspberry and Orange https://raspberryparatorpes.net/rivales/raspberry-pi-vs-orange-pi-2017/

Ubuntu users

#adduser username

#usermod -aG sudo username

$su - username

$whoami

$sudo whoami   

Examples to use

$fdisk -l

$sudo fdisk -l

$sudo ls -l /root



mySql Optimization parameters or commands

Query

SHOW GLOBAL STATUS

SHOW VARIABLES LIKE '%size%';
SHOW GLOBAL VARIABLES LIKE '%size%';

Settings

SET GLOBAL join_buffer_size = 1024 * 1024 * 128 #128M

or

[mysqld]
join_buffer_size = 128M  #default ~256K

 

References:

[0] Compute memory http://mysqlcalculator.com/ 

[1] join_buffer_size https://dba.stackexchange.com/questions/74693/how-to-break-table-into-two-without-losing-performance 

[2] https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html

[3] Example tunning https://dba.stackexchange.com/questions/127862/tuning-mysql-variables-to-accommodate-high-load

[4] Query variables https://dev.mysql.com/doc/refman/8.0/en/show-variables.html

Sunat Servicios Web

Resources:
[1] Code perl http://cpan.dei.uc.pt/authors/id/G/GP/GPAREDES/SUNAT/SEE.pm

[2] http://orientacion.sunat.gob.pe/index.php/empresas-menu/comprobantes-de-pago-empresas/comprobantes-de-pago-electronicos-empresas/see-desde-los-sistemas-del-contribuyente/guias-manuales-y-servicios-web

JavaScript Frameworks Lecture

References:

[1] https://reactjs.org/
[2] https://www.w3schools.com/whatis/whatis_react.asp
[3] Repository https://github.com/facebook/react

mySql Common Commands

CREATE TABLE foo LIKE bar;

CREATE TABLE IF NOT EXISTS offices_bk

SELECT * FROM

    offices;

==

CREATE TABLE IF NOT EXISTS new_table LIKE existing_table;

INSERT new_table

SELECT * FROM existing_table;

ALTER TABLE <tablename> CHANGE COLUMN <colname> <colname> VARCHAR(65536);

ALTER TABLE emp MODIFY COLUMN name VARCHAR(100);

Or use CHANGE, but that means you have to give the column name twice (because CHANGE allows you to change the name of the column too).
ALTER TABLE emp CHANGE COLUMN name name VARCHAR(100);

Linux Discover Teamviewer id

$sudo grep -n id /home/user/.local/share/teamviewer14/logfiles/TeamViewer14_Logfile.log

$whereis teamviewer
$/usr/bin/teamviewer help
$/usr/bin/teamviewer info #for get id too

$/usr/bin/teamviewer daemon stop
$/usr/bin/teamviewer setup
$/usr/bin/teamviewer daemon status
$/usr/bin/teamviewer daemon start

References:
[1] http://www.tonisoto.com/2013/07/launching-teamviewer-remotely-throught-ssh/

mySql change port problem

Can't start server: Bind on TCP/IP port: Permission denied
Do you already have another mysqld server running on port: 13306 ?


Common solution is change my.cnf adding port=newport, but in what section?

Discover who is the principal executable
$locate mysqld.service

/etc/systemd/system/multi-user.target.wants/mysqld.service
/usr/lib/systemd/system/mysqld.service

$vi /usr/lib/systemd/system/mysqld.service #for watch settings
In my case, was this:
ExecStart=/usr/bin/mysqld_safe --basedir=/usr

then i know what section i need to change

$vi /etc/my.cnf  # add new port in section [mysqld_safe]

Aditional commands during process:

tail -30 /var/log/mysql/error.log

sudo lsof -i TCP:3306
netstat -lp | grep 3306
 

$systemctl status iptables.service

$service iptables status

Ubuntu mySQL Backup/Restore

1)Create


2) Restore


$mysql -u root -p mysql
> create database mydb; mysql
> use mydb; mysql
> source db_backup.dump;


3) Another way, you  need to run:

$mysql -p -u[user] [database] < db_backup.dump

If the dump contains multiple databases you should omit the database name:

$mysql -p -u[user] < db_backup.dump

4) Restore specific database

$mysql -u onepoint -p --one-database maxx2016 < back_20190226.sql

Ubuntu Apache Django settings

References:
[1] main https://www.digitalocean.com/community/tutorials/how-to-serve-django-applications-with-apache-and-mod_wsgi-on-ubuntu-16-04

[2] https://coderwall.com/p/ooerda/python-django-apache-ubuntu
[3] https://www.digitalocean.com/community/tutorials/how-to-serve-django-applications-with-apache-and-mod_wsgi-on-debian-8

Fixing geopandas and osmnx problem: Could not find libspatialindex_c library file

For secondary problem trying to resolve (trying to find the library i got):
Traceback (most recent call last):
  File "", line 1, in
NameError: name 'find_library' is not defined
The solution is:

import ctypes
from ctypes.util import find_library

When you install environment and install geopandas, rtree and osmnx

pip install git+git://github.com/geopandas/geopandas.git

pip install rtree

pip install osmnx

No error, everythong aparently is ok, and you try to test

$python

>>> import rtree
Traceback (most recent call last):
 File "", line 1, in
 File "/var/www/sampleapp/crivist/myEnv/lib/python3.5/site-packages/rtree/__init__.py", line 1, in
   from .index import Rtree
 File "/var/www/sampleapp/crivist/myEnv/lib/python3.5/site-packages/rtree/index.py", line 5, in
   from . import core
 File "/var/www/sampleapp/crivist/myEnv/lib/python3.5/site-packages/rtree/core.py", line 125, in
   raise OSError("Could not find libspatialindex_c library file")
OSError: Could not find libspatialindex_c library file

You can solve using:
sudo apt install python3-rtree
But in some servers, you can't access to apt, then you decide do next commands:

$git clone https://github.com/libspatialindex/libspatialindex.git
$cd libspatialindex
$cmake --prefix=/usr .
$make
$sudo make install  #You cannot install on system

CMake Error at src/cmake_install.cmake:52 (file):
  file INSTALL cannot copy file
  "/home/fincahuanaco/Temp/libspatialindex/bin/libspatialindex.so.5.0.0" to
  "/usr/local/lib/libspatialindex.so.5.0.0".
Call Stack (most recent call first):
  cmake_install.cmake:42 (include)

But you compile, then you have the link to file, then set next variable

export SPATIALINDEX_C_LIBRARY=environmentpath/lib/libspatialindex_c.so


Enjoy

References:
[1] geopandas http://geopandas.org/install.html
[2] python environment https://docs.python-guide.org/dev/virtualenvs/
[3] python environment 2 https://docs.python.org/3/tutorial/venv.html

Level Set Topics

References:


[1] Methods In (Bio)Medical Image Analysis 2019 https://www.cs.cmu.edu/~galeotti/methods_course/

Print JavaScript

[1] PDF and HTML http://printjs.crabbly.com/

Latex On Line

Latex online

[1] Single/public https://www.papeeria.com

[2] Latex/R/Python/Octave/Julia/Shell/GPU https://cocalc.com/

[3] Single Latex & Octave http://www.verbosus.com/  #limit 4 resources

[4] Quick snap code to image quicklatex.com

 

Over google docs
http://docs.latexlab.org/


Single Compiler
[1] http://latex.informatik.uni-halle.de/latex-online/latex.php
[2] http://sciencesoft.at/latex/flatex.gsp?lang=en

After register
Unlimited https://www.sharelatex.com/
Monkey http://monkeytex.bradcater.webfactional.com/


 



Others References
[1] http://tex.stackexchange.com/questions/3/compiling-documents-online
[2] http://texblog.net/latex-link-archive/online-compiler/

Ubuntu VPN

References:

[1] https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04

[2] Setting clients https://www.utwente.nl/en/lisa/ict/manuals/network/vpn/openvpn-ubuntu-en/

Python 3D Interactive

[1] Python draw 2d and 3d http://jeffskinnerbox.me/notebooks/matplotlib-2d-and-3d-plotting-in-ipython.html

[2] Python 3D picking https://stackoverflow.com/questions/10424517/how-to-get-properties-of-picked-object-in-mplot3d-matplotlib-python

[3] Python mayavi picking http://docs.enthought.com/mayavi/mayavi/auto/example_pick_on_surface.html

[4] Python mayavi for 3D https://docs.enthought.com/mayavi/mayavi/mlab.html

Fedora 23 - Executing MONO Asp.NET MVC App

Table 'mysql.user' doesn't exist:ERROR
Or
ERROR 1146 (42S02): Table 'mysql.role_edges' doesn't exist

$mysql_upgrade -u root

Access problem (resolve inner mysql)

$mysql -u root -p
>show GRANTS FOR onepoint@localhost;


Execution problem



Turns out simply creating the folder using mkdir

$sudo mkdir /etc/mono/registry
$sudo chmod uog+rw /etc/mono/registry # setting the right permissions

Another way

You can set MONO_REGISTRY_PATH to point to a directory that you control:

$mkdir my-registry
$MONO_REGISTRY_PATH=`pwd`/my-registry
$xsp4

 

Next problem

System.MissingMethodException Method 'RouteCollection.get_AppendTrailingSlash' not found.




[uxxx@sxxx MaxxCoreWeb]$ mono --version
Mono JIT compiler version 4.0.5 (Stable 4.0.5.1/1d8d582 Mon Jan  4 11:09:45 UTC 2016)




These message showed because the system was build in mono 4.5 and mono 4.2 (both are compatible
for me in my system), but in my case i installed mono 4, lastest on Fedora 23.


Command for update repository to Fedora 27, but after update still doesn't ran
 

$rpm --import "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF"
$su -c 'curl https://download.mono-project.com/repo/centos7-stable.repo | tee /etc/yum.repos.d/mono-centos7-stable.repo'
$dnf update

I removed mono and tried to install mono 5, mono 4.8 and mono 4.2, but i got error of conflicts. Then i executed next command:

$sudo dnf autoremove #for remove dependences


And tried again and was successful.

$ sudo dnf install mono-complete-4.8.1.0-0.xamarin.1.x86_64




References:
[1] Upgrade tips https://fedoraproject.org/wiki/DNF_system_upgrade
[2] mono https://www.mono-project.com/download/stable/#download-lin-fedora

Fedora 23 Services

$systemctl status sshd.service
$systemctl enable httpd.service
$systemctl disable service_name.service

$systemctl start service_name.service

$systemctl stop service_name.service 

$systemctl restart service_name.service

$systemctl list-units --type=service 

References:
[1] General info https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/infrastructure-services/Services_and_Daemons/
[2] List services https://docs.fedoraproject.org/en-US/Fedora/15/html/Deployment_Guide/s1-services-running.html
 

 

Ubuntu mySQL Setting for remote access

1) Verify if is listenning
$wget --verbose http://localhost:3306
$wget --verbose http://192.168.0.12:3306
or
$nmap -sV localhost
$nmap -sV 192.168.0.12
or
$sudo netstat -tulpn
or
$sudo iptables -L -n

2) Verify file /etc/mysql/conf.d/  #include other possibles files
$sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf  #edit file and comment next line, or
$sudo gedit /etc/mysql/mysql.conf.d/mysqld.cnf

#bind-address        = 127.0.0.1

3) Add user


mysql>select user, host, authentication_string from mysql.user;

mysql>SHOW GRANTS FOR 'onepoint'@'%'; #if not exist

mysql> CREATE USER 'onepoint'@'localhost' IDENTIFIED BY 'password';
mysql> GRANT ALL PRIVILEGES ON Maxx2018.* TO 'onepoint'@'localhost' WITH GRANT OPTION;

mysql>CREATE USER 'onepoint'@'%' IDENTIFIED BY 'password';
mysql>GRANT ALL PRIVILEGES ON *.* TO 'onepoint'@'%' WITH GRANT OPTION;
mysql>GRANT ALL PRIVILEGES ON *.* TO 'onepoint'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
mysql>FLUSH PRIVILEGES;

4) Update user

mysql>use mysql;
mysql>update user set password=PASSWORD("NEWPASSWORD") where User='root'; 
mysql>flush privileges;


5) Common Errors


ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.


ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass'


ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

SET GLOBAL validate_password_policy=LOW;

You can edir /etc/mysql/my.cnf, but then you will have a security risk!
in [mysqld] add:

validate_password_policy=LOW

References:
[1] Firewall ubuntu https://stackoverflow.com/questions/30251889/how-to-open-some-ports-on-ubuntu
[2] https://stackoverflow.com/questions/14779104/how-to-allow-remote-connection-to-mysql

Fedora 29 mySQL

$sudo dnf install https://dev.mysql.com/get/mysql80-community-release-fc29-1.noarch.rpm

$sudo dnf --disablerepo=mysql80-community --enablerepo=mysql57-community install mysql-community-server


works too for Fedora 23 (Server Edition)

Problems
$ mysql -u root
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

$ sudo grep 'temporary password' /var/log/mysqld.log


Referencias:
[1] https://www.if-not-true-then-false.com/2010/install-mysql-on-fedora-centos-red-hat-rhel/

free VPN Service

vpnbook 2019 https://www.vpnbook.com/
  Username: vpnbook
  Password: rktbz9c


vpnbook (http://www.vpnbook.com/)
  Username: vpnbook
  Password: adv7ebeh
  .ovpn files  http://www.vpnbook.com/free-openvpn-account/VPNBook.com-OpenVPN-Euro1.zip

getusvpn (http://www.getusvpn.com/)

Notes:
After download OpenVPN Cliente on W7, run link (desktop) as Administrator.


References:

[1]  top 5 http://www.zeropaid.com/news/94826/top-5-free-vpn-services/
[2] http://www.tuvpn.com/es/tutoriales/openvpn-en-windows7#step-0
[3] Setting openvpn - ES https://hide.me/es/vpnsetup/ubuntu/openvpn/

Planes Internet Perú

Movistar
www.movistar.com.pe/negocio/internet-seguridad/internet-empresarial
www.movistar.com.pe/hogar/internet/solo-internet

Claro
www.claro.com.pe/negocios/fijos/adicionales/direcciones-ip-publicas/

Linux Fedora: Información de Hardware

En Windows, basta con instalar Everst, pero en Linux debemos seguir los siguientes pasos:

Paso 1: #yum install lshw lshw-gui

Paso 1: #yum install lshw lshw-gtk


Paso 2: #lshw


Otra forma es compilando desde el código fuente, asi :

Paso 1:#wget http://ezix.org/software/files/lshw-B.02.12.01.tar.gz
Paso 2:#tar -xvfz lshw-release.tar.gz
Paso 3:#cd lshw-B.02.12.01/src
Paso 4:#make
Paso 5:#lshw

make gui , para instalar interfaz gráfica


CONSTRUIR RPM package:

#rpmbuild -ta lshw-release.tar.gz
#rpmbuild -ta --with gui lshw-release.tar.gz

Linux Mono C#

$mono-csc searchmono.cs /out:seachmono -r:/usr/lib/mono/4.5/System.Web.dll

Compiling with mySql connector library
$mono-csc mysqlmono.cs /out:mysqlmono -r:System.Data.dll -r:/path/.nuget/packages/mysql.data/8.0.13/lib/net452/MySql.Data.dll


References:
[1] Example https://www.codeproject.com/Articles/9407/Introduction-to-Mono-Your-first-Mono-app
[2] Converter tools
     http://converter.telerik.com/
     https://codeconverter.icsharpcode.net/
     https://www.carlosag.net/tools/codetranslator/
[3] Mysql Connection https://www.mono-project.com/docs/database-access/providers/mysql/

Onde comprar no Brasil

Lojas online

[1] www.casasbahia.com.br
[2] www.extra.com.br
[3] www.americanas.com.br
[4] Notebook Accesories www.bringit.com.br
[5] www.kalunga.com.br
[6] Best Monitor prices than Notebook www.kabum.com.br
[7] Motos www.webmotors.com.br

Lojas remate
[1] www.saldaodainformatica.com.br

Ubuntu Services

sudo service --status-all


https://askubuntu.com/questions/912216/16-04-command-to-list-all-services-started-on-boot/912218

Linux small distro

Damn Small Project (bad)
Lubuntu 
Linux Lite (based on Ubuntu/Testing)
Tiny Core (Testing), works for Raspberry Pi
  Download:
  Installation GUI:
 

 $tce-load -wi Xvesa.tcz Xlibs.tcz Xprogs.tcz aterm.tcz flwm_topside.tcz wbar.tcz

 $tce-load -wi Xorg-7.7 #if Xvesa not found 

References:
[1] List of popular distros https://itsfoss.com/lightweight-linux-beginners/
[2] Comparison https://en.wikipedia.org/wiki/Light-weight_Linux_distribution
[3] Tiny Core installation https://iotbytes.wordpress.com/install-microcore-tiny-linux-on-local-disk/
[4] Tiny Core Packages http://distro.ibiblio.org/tinycorelinux/7.x/x86/tcz/
[5] Tiny Core Addin desktop http://wiki.tinycorelinux.net/wiki:adding_a_desktop_to_microcore
[6] WBar http://lxlinux.com/wbar.html

Ancho de Banda / Bandwidth Meter

Referencias
[1] www.speedtest.net
[2] http://openspeedtest.com
[3] https://www.meter.net

Ubuntu 16 - Setting PDF Printer

List of printers installed
$ls /etc/cups/ppd

Manually
Device URI:cups-pdf:/

By Command Line (Partial tested)

lpadmin -h localhost -p cups-pdf -v cups-pdf:/ -P /usr/share/cups/model/CUPS-PDF.ppd -E

Setting file (output/destination)
/etc/cups/cups-pdf.conf

Status Idle - File "/usr/lib/cups/backend/cups-pdf" has insecure permissions

$chmod 700 /usr/lib/cups/backend/cups-pdf

Null Printer
Device URI: file:/dev/null


References:
[1] Complete info https://en.opensuse.org/SDB:Printing_to_PDF

[2] openSUSE compile cups-pdf and ppd file https://pawn.physik.uni-wuerzburg.de/~vrbehr/cups-pdf/documentation.shtml
[3] CUPS PDF-WRITER Backend on Suse https://www.novell.com/coolsolutions/feature/17636.html

[4] Fake printer https://superuser.com/questions/304670/how-to-add-a-fake-dummy-null-printer-in-cups
[5] Install cups-pdf http://www.debianadmin.com/howto-install-and-customize-cups-pdf-in-debian.html

Fedora 29 Network Settings

References:
[1] https://alchemist.digital/articles/configure-a-static-ip-address-on-fedora-24-25/

Fedora 29 firewalld settings

$sudo service firewalld start 

$sudo firewall-cmd --list-all

$sudo firewall-cmd --get-zones

$sudo sudo firewall-cmd --zone=home --list-all

$sudo firewall-cmd --get-default-zone

$sudo firewall-cmd --get-active-zones

$sudo firewall-cmd --add-port=8081/tcp --permanent 
$sudo firewall-cmd --add-port=8081/udp --permanent 

$sudo firewall-cmd --reload  #important in Fedora 23 (VPS)
 
 
 
References:
[1] firewall-cmd https://docs.fedoraproject.org/en-US/Fedora/19/html/Security_Guide/sec-Open_Ports_in_the_firewall-CLI.html
[2] other firewall-cmd https://www.hiroom2.com/2017/07/12/fedora-26-firewalld-en/
[3] zones https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7

Fedora - mySQL restoring root

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

#service mysqld stop // id doesn't stop run #mysqladmin -u root -p shutdown

#mysqld_safe --skip-grant-tables &

#mysql -u root 

> use mysql;

> update user set password=PASSWORD("mynewpassword") where User='root';

> flush privileges;

> quit

#service mysqld stop 

#service mysqld start &

if mysqld_safe not exist (updated 2019)
# systemctl stop mysqld
# systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"
# systemctl start mysqld
$ mysql -u root
get temporaly password (updated 2019)

$sudo grep 'temporary password' /var/log/mysqld.log

A temporary password is generated for root@localhost: cvcvcv 

$mysql -u root -p 

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!'; 

https://dev.mysql.com/doc/refman/8.0/en/linux-installation-yum-repo.html
reference:
http://www.rackspace.com/knowledge_center/article/mysql-resetting-a-lost-mysql-root-password

Ubuntu 18 add Samba

References:
[1] https://websiteforstudents.com/samba-setup-on-ubuntu-16-04-17-10-18-04-with-windows-systems/

Monitor network bandwidth on Linux server

References:
[1] https://www.binarytides.com/linux-commands-monitor-network/

Ubuntu Memory type ddr2 ddr3

$ sudo dmidecode --type 17

$ sudo lshw -short -C memory
 
From [1]

DDR1: 2.5 V, 133–200 MHz
DDR2: 200–400 MHz
DDR3: 1.5 V, 400–800 MHz (up to 1400 MHz for super-high-end)
DDR4: 1.2 V, 2133–4266 MHz

For example: if shows up in lshw -short -C memory as simply 16GiB DIMM Synchronous 2133 MHz (0.5 ns). The MHz rating indicates that it's almost certainly DDR4.

References:
[1] memory types http://en.wikipedia.org/wiki/Synchronous_dynamic_random-access_memory#Generations_of_SDRAM
[2]

Ubuntu upgrade from i386 to x86_64

https://askubuntu.com/questions/5018/is-it-possible-to-upgrade-from-a-32bit-to-a-64bit-installation

Mono ASP.NET MVC

References
[1] http://www.developerslearnit.com/2016/11/build-master-details-crud-in-aspnet-mvc.html
[2] 

Search old pages, Archive of webpages

[1] https://web.archive.org
      for example compelligence.com
                          grpiaa.inf.pucp.edu.pe

Tensor resources

References:
 [1] Tensor decomposition https://www.slideshare.net/panisson/tensor-decomposition-with-python
 [2] Tensores (sp) http://bibing.us.es/proyectos/abreproy/12082/fichero/Cap%C3%ADtulo3.pdf

Ubuntu 16 OpenCV 2.4

Problems during compilation:

relocation R_X86_64_32 against `ff_a64_muxer' can not be used when making a shared object

Solution:
recompile ffmpeg-3.4.5 with(2018-11-29):
./configure --enable-nonfree --enable-pic --enable-shared

Download ffmpeg and build 3.4.5, 3.2.12 or 4.0 and try to compile opencv doesn't help, then

Final solution: disable ffmpeg
$cmake  -D WITH_CUDA=OFF -D WITH_FFMPEG=0 ..
$make

That compile opencv 2.4.x and 3.4.x



References:
[1] Error sys/videoio.h not found problem http://yutopapa.hatenadiary.com/entry/2017/06/08/173149

ASP.NET MVC Mono

Settings at 11/2018

.Net Framework 4.5.2 using project properties
Mysql.Data.Entity using NuGet(6.10.8)

Setup Web.config

<!--Added--> 
<configSections> <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.2.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections> 
<connectionStrings> 
  <add name="ferredb" connectionString="server=127.0.0.1;Port=3306;Database=ferre;Uid=root;Pwd=Microsoft;" providerName="MySql.Data.MySqlClient"/> </connectionStrings> 
<!--Added--> 
<entityFramework> 
<providers> 
  <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.10.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d">
  </provider> 
</providers> 
</entityFramework> 
<!--Added--> 
<system.data> 
<DbProviderFactories> <remove invariant="MySql.Data.MySqlClient" /> <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.10.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"/> 
 </DbProviderFactories> 
</system.data>

Fix version of entry System.Web.Mvc.MvcWebRazorHostFactory at views/Web.config


Classes

//Ado
using System;
using System.Data.Entity;
using MySQLEntity.Models;

namespace MySQLEntity.Entity
{

public class MyDb : DbContext
{
public MyDb() : base("ferredb")
//public MyDb() : base(nameOrConnectionString: "ferredb")
{
}
public DbSet<Usuario> Usuarios { get; set; }
}

}

//Entity
using System;
//Added
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;


namespace MySQLEntity.Models
{
        [Table("Users")]
        public class Usuario
        {
            [Key]
            public string usuario { get; set; }
            public string apenom  { get; set; }
        }

}



Controller Snippet code

public ActionResult Index()
{
  MyDb db = new MyDb();
  var Model=db.Usuarios.ToList();
  return View(Model);
}
View Snippet code

@foreach (var item in Model)
{

<div> @item.usuario @item.apenom </div>

}

Action results

References:
[1] MySQL EntityFramework web.config https://iyalovoi.wordpress.com/2015/04/06/entity-framework-with-mysql-on-mac-os/
[2] Action results
https://www.c-sharpcorner.com/article/different-types-of-action-results-in-asp-net-mvc/
[3] ViewBag better than DataView http://www.tutorialsteacher.com/mvc/viewbag-in-asp.net-mvc

mySQL Develop Optimization

Select * from MOVPRO where fecmov>='2018-11-25' and tipmov='S'
EXPLAIN Select * from MOVPRO where fecmov>='2018-11-25' and tipmov='S'

CREATE INDEX MOVPRO_fecmov_tipmov_index ON MOVPRO (fecmov,tipmov)


References:
[1] faster using indexes https://blog.nodeswat.com/making-slow-queries-fast-with-composite-indexes-in-mysql-eb452a8d6e46

python3 using mysql connection

$pip3 install mysql-connector-python --user

from mysql.connector import (connection)


cnx=connection.MySQLConnection(user='user', password='*******',
             host='ip', database='db')

cnx.close()


Resources:
[1] https://dev.mysql.com/doc/connector-python/en/connector-python-installation.html

API Testing

References
[1] postman https://steelkiwi.com/blog/api-testing-useful-tools-postman-tutorial-and-hints/

Water Simulation

Compiling Sources:
[1] 2D SPH https://github.com/tizian/SPH-Water-Simulation
    $sudo apt-cache search sfml
    $sudo apt-get install libsfml-dev
    #change for's
    $make
    $./sph

[2] WebGL water simulation https://experiments.withgoogle.com/webgl-water-simulation

[3] Google webgl https://experiments.withgoogle.com/search?q=fluid
  [3.1] http://david.li/fluid/
  [3.2] http://madebyevan.com/webgl-water/
[4] 3D Simulation/Animation/Fluids and more https://www.fetchcfd.com/search-projects/type/cfd

Related:
[1] Stanford su2 https://su2code.github.io/
[2] Multiple Interacting Fluids https://www.yiningkarlli.com/projects/multifluid.html

São Carlos to Guarulhos

1) Expensive alternative

São Carlos - SP to Rodoviária Tietê, São Paulo - SP  66.53R
https://passagemcometa.com.br

São Carlos - SP to Rodoviária Tietê, São Paulo - SP  66.55R
http://www.empresacruz.com.br

São Paulo - Tietê - SP to Aeroporto de Guarulhos      37.00R
http://www.airportbusservice.com.br/

2) Cheap alternative


São Carlos - SP to Campinas - SP                               40.53R
https://passagemcometa.com.br


São Carlos - SP to Campinas - SP                               40.55R
http://www.empresacruz.com.br

Campinas-SP to Aeroporto de Guarulhos-SP             42.75R
https://www.buscaonibus.com.br

English Tools

English test - Duolingo

[1] https://englishtest.duolingo.com/applicants

Lessons
  [1] https://webapps.towson.edu/ows/activepass.htm

e-Books
[1] http://www.kosstu.kz/static/uploads/library/gumanitar/english/g-e-91.pdf
     http://www.kosstu.kz/static/uploads/library/gumanitar/english/
[2] English Grammar In Use for Raymond Murphy. https://golammartoza.files.wordpress.com/2016/02/english-grammar-in-use-intermediate001.pdf


Online grammar
[1] http://www.gingersoftware.com/grammarcheck
[2] http://www.grammarcheck.net/editor/

Aditional helps

[1] https://www.websiteplanet.com/blog/talking-aloud-talking-allowed-watch-write-make-sure-right/

[2] For Presentation
  [2.1] Presentation Skills for Scientists

Physics resources

Physic Courses
[1] Cursos de Graduação em Engenharia do ITA http://www.ief.ita.br/~rrpela/

Foreings guide - Guia para extranjeros - Brasil

References:
[1] En http://portal.mj.gov.br/EstrangeiroWEB/guia_eng.pdf
[2] Sp http://portal.mj.gov.br/EstrangeiroWEB/guia_esp.pdf

Filtering

References:
[1] http://cattedraledigitale.isti.cnr.it
      2012 Bilateral filters https://onlinelibrary.wiley.com/doi/full/10.1111/j.1467-8659.2011.02078.x

[2] http://files.is.tue.mpg.de/pgehler/assets/publications/jampani16learning/jampani16learning.pdf
[3] https://zapdf.com/fast-high-dimensional-filtering-using-clustering.html


[6] http://www.inf.ufrgs.br/~oliveira/students_dissertations/PhD/Eduardo_Gastal_PhD_Dissertation.pdf
[7] https://is.tuebingen.mpg.de/uploads_file/attachment/attachment/259/0766_cameraready.pdf
[8] http://www.scitepress.org/Papers/2016/57151/57151.pdf
[9] http://vision.ai.illinois.edu/publications/yangijcv2015.pdf
http://openaccess.thecvf.com/content_cvpr_2018/papers/Wu_Fast_End-to-End_Trainable_CVPR_2018_paper.pdf
http://perso.ensta-paristech.fr/~manzaner/Publis/icpr10.pdf
http://www.cs.cityu.edu.hk/~rynson/papers/tcsvt16a.pdf
https://arxiv.org/pdf/1505.00077.pdf
https://fukushima.web.nitech.ac.jp/paper/2016_visapp_fujita.pdf
http://www.riken.jp/brict/Yoshizawa/Papers/cgf09yby.pdf

High-dimensional integration without Markov chains, Alexander gray
https://www.cs.ubc.ca/~nando/nipsfast/slides/high.pdf

Fast edge-preserving/-aware high dimensional filters for image & video processing https://www.slideshare.net/yuhuang/fast-edge-preservingaware-high-dimensional-filters-for-image-video-processing

 

Aditional
[1] Parallel methods for Numeric Analysis http://adl.stanford.edu/cme342/Home.html
[2] Fast Multipole Methods https://www.math.uci.edu/~chenlong/MathPKU/FMMsimple.pdf

Resources
[1] ImageStack https://code.google.com/archive/p/imagestack/
                          https://github.com/abadams/imagestack
[2] RGBD Utils, use ImageStack https://github.com/s-gupta/rgbdutils

[3] Recursive bilateral filtering  https://github.com/ufoym/RecursiveBF
    ./rbf girl_out.bmp girl.bmp 0.1 0.04
    file https://media.macphun.com/img/uploads/uploads/macphun/noiseless/nl_slider_1_b.jpg
[4] Bilateral grid http://groups.csail.mit.edu/graphics/bilagrid/
[5] Bilateral upsampling http://people.csail.mit.edu/jiawen/

Python tools
[1] ndimage 3D convolution https://docs.scipy.org/doc/scipy-0.16.0/reference/ndimage.html