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CMCDragonkai / wework_wifi_on_linux_with_nmcli.md
Last active September 1, 2026 09:55
WeWork WiFi on Linux with `nmcli`

WeWork WiFi on Linux

When using nmcli device wifi connect 'WeWorkWiFi' password '...', you'll get something like:

Error: Failed to add/activate new connection: Failed to determine AP security information

To actually use it, you need to create a connection first and configure it:

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CMCDragonkai / ppi_and_dpi.sh
Last active August 25, 2026 21:47
CLI/X: Get the Real DPI/PPI of your Monitors/Display Devices on Linux
#!/usr/bin/env bash
# this will acquire the real PPI/DPI of the preferred/native mode of your monitors
# the DPI reported by `xdpyinfo` is not the real DPI, but your virtual DPI
# that may have been automatically calculated from the EDID information
# or manually set previously
# works in ZSH too
# requires xrandr, perl and bc
# in bc, only division respects scale, so we have to force a useless division
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CMCDragonkai / check_machine_virtualization.md
Last active August 21, 2026 09:54
Check if your machine is capable of virtualization (with QEMU & KVM) #linux

Check if your machine is capable of virtualization (with QEMU & KVM) without going into the BIOS

Run virt-host-validate which is the part of the libvirt package.

> virt-host-validate
  QEMU: Checking for hardware virtualization                                 : PASS
  QEMU: Checking if device /dev/kvm exists                                   : PASS
  QEMU: Checking if device /dev/kvm is accessible                            : PASS
  QEMU: Checking if device /dev/vhost-net exists                             : PASS
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CMCDragonkai / job_control_zsh_bash.md
Last active August 19, 2026 19:20
CLI: Job Control in ZSH and Bash

Job Control in ZSH and Bash

All processes in ZSH/Bash under job control are in 3 states: foregrounded, backgrounded and suspended.

# run command in the foreground
command
# run commend in the background
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CMCDragonkai / memory_layout.md
Last active August 17, 2026 21:45
Linux: Understanding the Memory Layout of Linux Executables

Understanding the Memory Layout of Linux Executables

Required tools for playing around with memory:

  • hexdump
  • objdump
  • readelf
  • xxd
  • gcore
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CMCDragonkai / http_streaming.md
Last active July 21, 2026 02:42
HTTP Streaming (or Chunked vs Store & Forward)

HTTP Streaming (or Chunked vs Store & Forward)

The standard way of understanding the HTTP protocol is via the request reply pattern. Each HTTP transaction consists of a finitely bounded HTTP request and a finitely bounded HTTP response.

However it's also possible for both parts of an HTTP 1.1 transaction to stream their possibly infinitely bounded data. The advantages is that the sender can send data that is beyond the sender's memory limit, and the receiver can act on

@CMCDragonkai
CMCDragonkai / angularjs_directive_attribute_explanation.md
Last active July 17, 2026 02:02
JS: AngularJS Directive Attribute Binding Explanation

AngularJS Directive Attribute Binding Explanation

When using directives, you often need to pass parameters to the directive. This can be done in several ways. The first 3 can be used whether scope is true or false. This is still a WIP, so validate for yourself.

  1. Raw Attribute Strings

    <div my-directive="some string" another-param="another string"></div>
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CMCDragonkai / regular_expression_engine_comparison.md
Last active July 13, 2026 23:31
Regular Expression Engine Comparison Chart

Regular Expression Engine Comparison Chart

Many different applications claim to support regular expressions. But what does that even mean?

Well there are lots of different regular expression engines, and they all have different feature sets and different time-space efficiencies.

The information here is just copied from: http://regular-expressions.mobi/refflavors.html

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CMCDragonkai / exporting_modules_functions_from_python_init.md
Last active July 9, 2026 12:23
Exporting Modules and Functions from Python `__init__.py` #python

Exporting Modules and Functions from Python __init__.py

Any directory with __init__.py is considered a package in Python.

Any python files inside a package is considered a module.

Modules contain functions and other bindings that is always exported.

If you are outside the package, and you want to import a module from a package:

@CMCDragonkai
CMCDragonkai / trusted_certificate_stores_on_linux_os_and_applications.md
Last active June 22, 2026 09:26
SSL/TLS: Trusted Certificate Stores on Linux Operating Systems and Applications

Trusted SSL/TLS Certificate Stores on Linux Operating Systems and Applications

The SSL/TLS store location is not standardised across operating systems or even Linux distros. It could be anywhere in:

  • /etc/ssl/certs
  • /etc/pki/tls/certs/ca-bundle.crt
  • /etc/ssl/certs/ca-bundle.crt
  • /etc/pki/tls/certs/ca-bundle.trust.crt