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Creating a Virtual Environment

python3 -m venv /path/to/new/virtual/environment

Activating a Virtual Environment

Unix

source venv/bin/activate

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<!-- Inline variable -->
{{ variable_name }}

<!-- Loop -->
{% with messages = get_flashed_messages(with_categories=True) %}
{%- if messages %}
    {% for category, message in messages %}
		<p>{{ message }}</p>
    {% endfor %}
{% endif -%}

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Install Packages from requirements.txt file

pip install -r requirements.txt

Note: This command most likely requires Administrator privileges.

Uninstall Packages

pip uninstall <packagename>

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Get system information

Get general information about Linux distribution

lsb_release -a

Check disk space

df -h

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Device configuration menu

sudo raspi-config

Check the device temperature

vcgencmd measure_temp

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Start the server

cd ~/papermc-server
java -Xmx2048M -Xms2048M -jar server.jar nogui

-Xms<n>
Specifies the initial size, in bytes, of the memory allocation pool.

-Xmx<n>
Specifies the maximum size, in bytes, of the memory allocation pool.

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Update

pihole -up

Reset password

pihole -a -p

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Installation

The screen package is pre-installed on most Linux distros nowadays. You can check if it is installed on your system by typing:

screen --version

If it is not installed it can be installed via:

sudo apt install screen

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Shutdown

Command	Description
shutdown /s	Shut down the computer
shutdown /r	Restart the computer
shutdown /l	Log off from computer

Clear local DNS cache

ipconfig /flushdns

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Daemon Threads

When Daemon Threads are useful

In a big project, some threads are there to do some background task such as sending data, performing periodic garbage collection etc. It can be done by non-daemon thread. But if non-daemon thread is used, the main thread has to keep track of them manually. However, using daemon thread the main thread can completely forget about this task and this task will either complete or be killed when main thread exits.