Enable remote desktop Windows 10 to Ubuntu 18.04

Steps:

Step 1:

Ubuntu.

Install next command on terminal:

sudo apt install xrdp

sudo systemctl enable xrdp

If you want check status, change enable to status or if you want disable type disable.

Step 2:

Windows 10.

Type on search: remote desktop.

Type your ip or hostaname on next windows:

When you click on connect automatically open next windows, type your username and password to remote desktop Ubuntu.

Kill port on Windows 10 by console

Open console with admin user.

Righ click on CMD open with administrador

Run next command:

netstat -ano | findstr :YOUR_PORT

Find PID and next

taskkill /PID YOUR_PID /F

Example:

Change dynamic value mat icon Angular 8 or greater

I share example how to change dynamic value mat icon with Angular.

Example, In my case, I want to change mat-icon expand_less to expand_more

HTML

 <button mat-icon-button color="primary">

   <mat-icon id="mat-{{name_dynamic_id}}" matTooltip="" aria-label="">

expand_less

</mat-icon>

 </button>

TS, Use native javascript.

Get Id.

var dynamicMatIccon = document.getElementById("mat-" + value);

Change value:

dynamicMatIccon.innerHTML = "expand_more";

That it is.

Linux tips

Number of files

 ls -l filename* | wc -l

Command to print directory structure 

ls -R MY_FOLDER | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//──/g' -e 's/─/├/' -e '$s/├/└/'

List only directories

ls -l | grep '^d'

Count total number of files in particular directory with specific extension.

ls -lR /path/to/dir/*.jpg | wc -l

Max thread, we can use. or number CPU.

lscpu

GREP

-Search multiple strings

grep '1\|2\|3' filename

-Number of lines with specific pattern search

grep -o 'STRING' filename | wc -l

SED

Replace values in file,

sed -i 's/old_string/new_string/' filename

With special character simple quotes

sed -i "s/old_string/'new_string'/g" filename

Add header string in the file.

sed -i '1s/^/addedtext\n/' filename

Add footer string in the file

echo "helloworld" | tee -a filename >/dev/null

Change extension filename in loop

for f in filename.txt;do mv $f  $f.sql;done

Split larger files into smaller parts 

-l number of lines

split -l 500000 filename

--bytes

K

M

G

Execute next the command on terminal example:

split --bytes=1G path/your_file.extension path/your_new_file.extension

Convert file UTF-8

iconv -f ISO-8859-1 -t UTF-8//TRANSLIT filein.txt > fileout.txt

Check special character on file 

grep --color='auto' -P -n "[\x80-\xFF]" file.txt

Could not get lock /var/lib/dpkg/lock-frontend - open

Delete the lock file:

sudo rm /var/lib/apt/lists/lock

Delete the lock file in the cache directory

sudo rm /var/cache/apt/archives/lock

sudo rm /var/lib/dpkg/lock

Generate RSA private and public key

Private key:

openssl genrsa -out private.pem 2048

Public Key from RSA private key:

openssl rsa -in private.pem -outform PEM -pubout -out public.pem

WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

Solution: run next command

ssh-keygen -R  YOUR_IP

Could not find acceptable representation .COM PathVariable Spring boot 2

Solution next error.

In your method RESTful web service add.


@GetMapping("/public/file/{url_filename:.*}")

And create next class.

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {

@Override
public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
configurer.favorPathExtension(false).favorParameter(true);
}

}

Caused by: org.hibernate.AnnotationException: No identifier specified for entity

Solution next Error:

you need to add primary key in your table database and  add id(@Id) annotation attribute on your class in java.

Can't serve static html with Spring Boot 2

Solution next error.

Add next class:

package your_package;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class StaticResourceConfiguration implements WebMvcConfigurer {

 private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {
  "classpath:/META-INF/resources/",
  "classpath:/resources/",
  "classpath:/static/",
  "classpath:/public/"
 };

 @Override
 public void addResourceHandlers(ResourceHandlerRegistry registry) {
  registry.addResourceHandler("/**")
   .addResourceLocations(CLASSPATH_RESOURCE_LOCATIONS);
 }

}


and try again access, for example:

http:localhost:8080/your_html.html

or

http:localhost:8080/your_context/your_html.html













References:
https://spring.io/blog/2013/12/19/serving-static-web-content-with-spring-boot