Blog | Hikari's Notebook

Summary of frequently used dotnet commands

March 28, 2024 · One min read

Command	Function
`dotnet new`	Create a new project
`dotnet add`	Add a package
`dotnet remove`	Remove a package
`dotnet publish`	Publish an app to a directory
`dotnet run`	Run the project
`dotnet sln`	Manage solution files

dotnet new

Example

dotnet new wpf

dotnet add

Example

dotnet add package Microsoft.Web.WebView2

dotnet remove

Example

dotnet remove package Microsoft.Web.WebView2

Linux Network Management Commands (nmcli and nmtui)

March 21, 2024 · 2 min read

nmcli

`nmcli connection`: Display all connections

pi@raspberrypi:~ $ nmcli connection
NAME           UUID                                  TYPE      DEVICE
preconfigured  1b29633c-51a7-42a8-8357-a23ddbb791b9  wifi      wlan0
lo             37334688-5c87-47fc-87d3-8c4e31934dd2  loopback  lo
有線接続 1     0df9157e-b1a9-3026-9bd5-f05234e1cf4b  ethernet  --

`nmcli device`: Display devices and their states

pi@raspberrypi:~ $ nmcli device
DEVICE         TYPE      STATE            CONNECTION
wlan0          wifi      接続済み         preconfigured
lo             loopback  接続済み (外部)  lo
p2p-dev-wlan0  wifi-p2p  切断済み         --
eth0           ethernet  利用不可         --

`nmcli connection show ...`: Display properties

Run nmcli connection show <profile name> to display its properties.

pi@raspberrypi:~ $ nmcli connection show <プロファイル名>
connection.id:                          <プロファイル名>
connection.uuid:                        1b29633c-51a7-42a8-8357-a23ddbb791b9
connection.stable-id:                   --
connection.type:                        802-11-wireless
connection.interface-name:              --
connection.autoconnect:                 はい
connection.autoconnect-priority:        0
connection.autoconnect-retries:         -1 (default)
connection.multi-connect:               0 (default)
connection.auth-retries:                -1
connection.timestamp:                   1710955164
connection.read-only:                   いいえ
connection.permissions:                 --
connection.zone:                        --
connection.master:                      --
connection.slave-type:                  --
connection.autoconnect-slaves:          -1 (default)
connection.secondaries:                 --
connection.gateway-ping-timeout:        0
connection.metered:                     不明
connection.lldp:                        default
connection.mdns:                        -1 (default)
connection.llmnr:                       -1 (default)
connection.dns-over-tls:                -1 (default)
lines 1-24

Check IP address

pi@raspberrypi:~ $ nmcli connection show <プロファイル名> | grep ipv4.addresses
ipv4.addresses:                         192.168.10.113/24

Set IP address

In the example below, the IP address is set to 192.168.10.113 and the prefix length to 24.

sudo nmcli connection modify <プロファイル名> ipv4.addresses 192.168.10.113/24

Check DNS server

pi@raspberrypi:~ $ nmcli connection show <プロファイル名> | grep ipv4.dns:
ipv4.dns:                               192.168.10.1

Set DNS server

In the example below, the DNS server is set to 192.168.10.1.

sudo nmcli connection modify <プロファイル名> ipv4.dns 192.168.10.1

Disconnect a connection

sudo nmcli connection down <プロファイル名>

Connect a connection

sudo nmcli connection up <プロファイル名>

nmtui: Configure network connections with TUI

sudo nmtui

How to Japanese the Linux Prompt

March 19, 2024 · One min read

This post introduces how to Japanese the Linux prompt.

1. Install Japanese Locale

Next, if the Japanese locale does not exist, install it with the following command.

sudo apt update
sudo apt install language-pack-ja

2. Set the Locale

Set the Japanese locale with the following command.

sudo update-locale LANG=ja_JP.UTF8

3. Restart the System

Finally, restart the system. This will reflect the new locale settings.

sudo reboot

With the above steps, the Linux prompt will be Japanese.

How to change the Linux prompt to Japanese

March 19, 2024 · One min read

This post explains how to localize the prompt on Raspberry Pi.

1. Setting the locale

Set the Japanese locale. Execute the following commands:

Check the box as shown with a space and OK.
Select ja_JP.UTF-8 and OK.

sudo dpkg-reconfigure locales

# [*] ja_JP.UTF-8 UTF-8

2. Reboot

Reboot the system.

sudo reboot

That's all.

How to install pyenv and Python on Ubuntu (including WSL2)

March 16, 2024 · One min read

Install Dependencies

Reference: Home · pyenv/pyenv Wiki

sudo apt update
sudo apt install build-essential libssl-dev zlib1g-dev \
   libbz2-dev libreadline-dev libsqlite3-dev curl \
   libncursesw5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev libffi-dev lbmzma-dev

Install pyenv

Reference: [pyenv/pyenv-installer: This tool is used to install pyenv and friends.] (https://github.com/pyenv/pyenv-installer?tab=readme-ov-file)

curl https://pyenv.run | bash

Add initialization script to ~/.bashrc

# Open ~/.bashrc
code ~/.bashrc

Add the following:

export PYENV_ROOT="$HOME/.pyenv"
[[ -d $PYENV_ROOT/bin ]] && export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init -)"

eval "$(pyenv virtualenv-init -)"

Install Python

Display a list of installable versions

pyenv install -l

Install Python

Install Python 3.12.2.

pyenv install 3.12.2

Set the Python version

Set the default version to Python 3.12.2.

pyenv global 3.12.2

python -V # Python 3.12.2

How to install .NET on Ubuntu (including WSL2)

March 9, 2024 · One min read

Reference: Install .NET on Linux without using a package manager - .NET | Microsoft Learn

Download the install script

wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh

Make the install script executable

chmod +x ./dotnet-install.sh

Install the dot.net SDK

./dotnet-install.sh

To install the latest version

./dotnet-install.sh --version latest

Add to path

Open $HOME/.bashrc and add the following:

export DOTNET_ROOT=$HOME/.dotnet
export PATH=$PATH:$DOTNET_ROOT:$DOTNET_ROOT/tools

How to expose a server on WSL2 to the LAN using SSH tunneling

February 26, 2024 · 2 min read

Step1. Install OpenSSH Server on WSL

Install OpenSSH Server on WSL2. Also, start the sshd service.

# WSL2 side
sudo apt install openssh-server
sudo service sshd start

Step2. Register the public key on the Windows side

If you have not registered the public key on Windows, run the following command.

# Windows side
ssh-keygent -t ed25519

Next, register the public key on WSL2.

# Windows side
$pubkey = $(cat $HOME\.ssh\id_ed25519.pub)
wsl -- echo $pubkey `| tee -a `$HOME/.ssh/authorized_keys

Step3. Tunnel with SSH

Connect to WSL2 from Windows via SSH.

# Windows side
ssh (wsl -- hostname -I).trim() -g -L8081:localhost:8080

Explanation of the command:

(wsl -- hostname -I).trim() retrieves the IP address of WSL2.
-g forwards the port to the LAN (accessible from external devices with an address like 192.168.x.x).
-L is the local forward option. It forwards the server's port to a local port.
8081 and localhost:8080 mean that accessing http://localhost:8081 will forward to localhost:8080. Here, localhost refers to localhost as seen from the server side.

Step4. Start the server

Start the server that you want to expose on WSL2.

# WSL2 side
ruby -run -e httpd . # Directory listing will be exposed

Step5. Access the server

You can access the service at http://localhost:8081 or http://<IP address displayed by ipcconfig>:8081.

A disadvantage of tunnel connections is that it is tedious to tunnel every time. Although unstable, you can do the same thing by using netsh interface portproxy ~.

Implementing a right-click menu with JavaScript, HTML, and CSS

February 25, 2024 · One min read

JavaScript

id="contextmenu" is the menu body, and id="main" is the part where the menu is displayed.

const contextmenu = document.getElementById('contextmenu');
const main = document.getElementById("main");
main.addEventListener('contextmenu', (e) => {
   e.preventDefault();
   contextmenu.style.left = e.pageX + 'px';
   contextmenu.style.top = e.pageY + 'px';
   contextmenu.style.display = 'block';
});
main.addEventListener('click', () => {
   contextmenu.style.display = 'none';
});

HTML

<div id="contextmenu">
    <ul>
        <li>Delete</li>
    </ul>
</div>

CSS

#contextmenu {
   display: none;
   position: fixed;
   left: 0;
   top: 0;
   border-radius: 8px;
   background-color: #F9F9F9;
   border: solid 1px #E3E3E3;
   padding: 4px;
   width: 192px;
}

#contextmenu ul{
   padding-left: 0;
   margin: 0;
}

#contextmenu li {
   cursor: pointer;
   margin: 0;
   padding: 4.75px 0 4.75px 16px;
   border-radius: 4px;
   list-style: none;
   font-size: 14px;
}

※ The event and functionality for when it is clicked will need to be created separately.

Installation Guide for rbenv (WSL2 / Ubuntu)

February 24, 2024 · One min read

Installing Dependencies

https://github.com/rbenv/ruby-build/wiki#ubuuntdebiandmint

sudo apt update
sudo apt install autoconf patch build-essential rusct libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libgmp-dev libncurses5-dev libffi-dev libgdbm6 libgdbm-dev libdb-dev uuid-dev -y

Installing rbenv

# Install rbenv and ruby-build
curl -fsSL https://github.com/rbenv/rbenv-installer/raw/HEAD/bin/rbenv-installer | bash

# Initialize rbenv on startup
echo 'eval "$($HOME/.rbenv/bin/rbenv init - bash)"' | tee -a ~/.bashrc

Reference

https://github.com/rbenv/rbenv-installer

Installing Ruby 3.3.0

source ~/.bashrc    # Initialize rbenv (can also be done after re-logging into WSL)
rbenv install 3.3.0 # Install Ruby 3.3.0
rbenv global 3.3.0  # Set Ruby 3.3.0 as the default

Reference

https://github.com/rbenv/rbenv

plink

February 19, 2024 · One min read

Using SerialConsole with Windows Terminal and pliink

Writing a Serial Communication Program for Arduino

To test serial communication using Windows Terminal and pliink, we will write a serial communication program for Arduino.

void setup() {
 Serial.begin(9600);
}

void loop() {
 if(Serial.aavailable() <= 0) return;
 char data = Serial.read();
 if(data == '\r'){
   Serial.print("\n");
 }else{
   Serial.print(data);
 }
}

Serial Communication with Arduino using pliink

The following command executes a pliink command from Windows Terminal to perform serial communication with Arduino.

pliink -serial COM1 -sercfg 9600,8,1,N,N

dotnet new​

Example​

dotnet add​

Example​

dotnet remove​

Example​

nmcli​

nmcli connection: Display all connections​

nmcli device: Display devices and their states​

nmcli connection show ...: Display properties​

Check IP address​

Set IP address​

Check DNS server​

Set DNS server​

Disconnect a connection​

Connect a connection​

nmtui: Configure network connections with TUI​

1. Install Japanese Locale​

2. Set the Locale​

3. Restart the System​

1. Setting the locale​

2. Reboot​

Install Dependencies​

Install pyenv​

Add initialization script to ~/.bashrc​

Install Python​

Display a list of installable versions​

Install Python​

Set the Python version​

Download the install script​

Make the install script executable​

Install the dot.net SDK​

To install the latest version​

Add to path​

Step1. Install OpenSSH Server on WSL​

Step2. Register the public key on the Windows side​

Step3. Tunnel with SSH​

Step4. Start the server​

Step5. Access the server​

JavaScript​

HTML​

CSS​

Installing Dependencies​

Installing rbenv​

Reference​

Installing Ruby 3.3.0​

Reference​

Using SerialConsole with Windows Terminal and pliink​

Writing a Serial Communication Program for Arduino​

Serial Communication with Arduino using pliink​

dotnet new

Example

dotnet add

Example

dotnet remove

Example

nmcli

`nmcli connection`: Display all connections

`nmcli device`: Display devices and their states

`nmcli connection show ...`: Display properties

Check IP address

Set IP address

Check DNS server

Set DNS server

Disconnect a connection

Connect a connection

nmtui: Configure network connections with TUI

1. Install Japanese Locale

2. Set the Locale

3. Restart the System

1. Setting the locale

2. Reboot

Install Dependencies

Install pyenv

Add initialization script to ~/.bashrc

Install Python

Display a list of installable versions

Install Python

Set the Python version

Download the install script

Make the install script executable

Install the dot.net SDK

To install the latest version

Add to path

Step1. Install OpenSSH Server on WSL

Step2. Register the public key on the Windows side

Step3. Tunnel with SSH

Step4. Start the server

Step5. Access the server

JavaScript

HTML

CSS

Installing Dependencies

Installing rbenv

Reference

Installing Ruby 3.3.0

Reference

Using SerialConsole with Windows Terminal and pliink

Writing a Serial Communication Program for Arduino

Serial Communication with Arduino using pliink