Connect to localhost from Docker container

For Win and Mac:

  • localhost and 127.0.0.1 – These resolve to the container.
  • host.docker.internal – This resolves to the outside host.

Reference

RabbitMQ CLI tools

Error Message:

CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)

Solution from here

Ensure cookies are synchronized across 1, 2 and Optionally 3 below

  1. %HOMEDRIVE%%HOMEPATH%\.erlang.cookie (usually C:\Users\%USERNAME%\.erlang.cookie for user %USERNAME%) if both the HOMEDRIVE and HOMEPATH environment variables are set

  2. %USERPROFILE%\.erlang.cookie (usually C:\Users\%USERNAME%\.erlang.cookie) if HOMEDRIVE and HOMEPATH are not both set

  3. For the RabbitMQ Windows service - %USERPROFILE%\.erlang.cookie (usually C:\WINDOWS\system32\config\systemprofile)

Trimming video using FFMpeg

See here

Freeing up disk space - Linux

Reference: article

  • sudo apt-get autoremove
  • Remove apt cache: sudo apt-get clean
  • sudo journalctl --vacuum-time=3d
  • Remove old revisions of snaps:
#!/bin/bash
# Removes old revisions of snaps
# CLOSE ALL SNAPS BEFORE RUNNING THIS
set -eu
snap list --all | awk '/disabled/{print $1, $3}' |
    while read snapname revision; do
        snap remove "$snapname" --revision="$revision"
    done
  • Clean the thumbnail cache:

rm -rf ~/.cache/thumbnails/*

Can use ncdu to check disk space from command line as well.

ImageMagick script for converting .heic to .jpg

import os
import subprocess

lst = os.listdir(".")
for entry in lst:
    if entry.lower().endswith(".heic"):
        fname = os.path.basename(entry).split(".")[0] + ".jpg"
        print(f"Converting {entry} to {fname}")
        ran_proc = subprocess.run(["magick",entry,"-quality","100%",fname])
        if ran_proc.stdout:
            print(f"Stdout is {ran_proc.stdout}")
        if ran_proc.stderr:
            print(f"Stderr is {ran_proc.stderr}")

pip installing packages globally

When pip inside virtualenv is installing packages globally check the following:

Try checking your bin/pip and bin/activate scripts. In bin/pip, look at the shebang. Is it correct? If not, correct it. Then on line ~42 in your bin/activate, check to see if your virtualenv path is right. It'll look something like this

VIRTUAL_ENV="/Users/me/path/to/virtual/environment"

If that fails, run the virtual environments pip with its full path.

Reference

How to change user

su - john # if john is the user

Python Requests library using proxy

Set environment variables http_proxy and https_proxy. These can be used by pip as well

Using Azure AD access token for non Microsoft Graph API

See here. They key is that the scopes array should have a single element with: "<YourClientId>/.default.

When following the example here, make sure to replace the scopes with "<YourClientId>/.default.

Replace text using Powershell

(Get-Content .\file.txt) -replace "!", ","  | Set-Content -Path .\replaced.txt

Using PugiXML with Qt

  • Make sure to include pugi's cpp and headers in the .pro file

Neovim restore Windows Terminal cursor on exit

vim.cmd [[
  autocmd VimLeave * set guicursor=a:ver20a:blinkwait700-blinkoff400-blinkon250-Cursor/lCursor,sm:block-blinkwait175-blinkoff150-blinkon175
]]

Frappe Gantt chart

See here

Using PyPDF2 to decrypt a PDF

See here

Might need to install pyCryptodome first pip install pycryptodome

# Decrypt password-protected PDF in Python.
# cleaned-up version of http://stackoverflow.com/a/26537710/329263
# 
# Requirements:
# pip install PyPDF2
#
# Usage: decrypt_pdf('encrypted.pdf', 'decrypted.pdf', 'secret_password')
import sys

from PyPDF2 import PdfFileReader, PdfFileWriter

def decrypt_pdf(input_path, output_path, password):
  with open(input_path, 'rb') as input_file, \
    open(output_path, 'wb') as output_file:
    reader = PdfFileReader(input_file)
    reader.decrypt(password)

    writer = PdfFileWriter()

    for i in range(reader.getNumPages()):
      writer.addPage(reader.getPage(i))

    writer.write(output_file)
    print(f"Done. wrote to {output_file}")

if __name__ == '__main__':
  input_file = sys.argv[1]
  output_file = sys.argv[2]
  password = sys.argv[3]
  # example usage:
  decrypt_pdf(input_file,output_file,password)

Postgres UPSERT operation

Source: here

Excerpt:

CREATE TABLE inventory(
   id INT PRIMARY KEY,
   name VARCHAR(255) NOT NULL,
   price DECIMAL(10,2) NOT NULL,
   quantity INT NOT NULL
);

INSERT INTO inventory(id, name, price, quantity)
VALUES
	(1, 'A', 15.99, 100),
	(2, 'B', 25.49, 50),
	(3, 'C', 19.95, 75)
RETURNING *;

Here, EXCLUDED means "use the new value"

INSERT INTO inventory (id, name, price, quantity)
VALUES (1, 'A', 16.99, 120)
ON CONFLICT(id) 
DO UPDATE SET
  price = EXCLUDED.price,
  quantity = EXCLUDED.quantity;

Git rebase into forked repo

Excerpted from here

  1. Add the remote (original repo that you forked) and call it “upstream”
git remote add upstream https://github.com/original-repo/goes-here.git
  1. Fetch all branches of remote upstream
git fetch upstream
  1. Rewrite your master with upstream’s master using git rebase.
git rebase upstream/master
  1. Push your updates to master. You may need to force the push with “--force”.
git push origin master --force

Error parsing ws-trust response

If this happens, use AcquireTokenInteractive.

Cadence report command line tool

To get at the Quick Reports from the command line, use the report command line tool like so:

report -v elp <path to .brd file> <output.txt>

To see a list of all the command line parameters type

report -help

User has not been granted requested logon

If seeing this error, follow the steps here

Windows disk cleanup script

Remove-Item -Path "$env:tmp\" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:userprofile\appdata\local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams\" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:appdata\Code\Service Worker\CacheStorage\" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:appdata\Teams\Service Worker\CacheStorage\" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:userprofile\appdata\local\Microsoft\Edge\User Data\" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:userprofile\appdata\local\Microsoft\vscode-cpptools\" -Recurse -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:userprofile\Downloads\" -Recurse -Force -ErrorAction SilentlyContinue

Distutils and Python 3.12

Install setuptools using pip instead as python 3.12 removed distutils.

Zip and unzip on Linux

zip -r <backup.zip> <directory_name>

Example:

zip -r backup.zip my_folder/

Notice that the / is very important! To unzip:

unzip [file_name.zip]

Source

Vim find all in file and show in quickfix window

:vimgrep /pattern/ %

and then

:copen

or

:cwindow

.vimrc for gvim (Windows)

source $VIMRUNTIME/vimrc_example.vim
source $VIMRUNTIME/mswin.vim

imap jk <Esc>
au VimEnter * imap jk <Esc>
"set guifont=Consolas:h11
set guifont=Cascadia\ Code:h12
set number
"set guifont=Cascadia Code:h11
colorscheme onedark
set encoding=utf-8
"colorscheme summerfruit

set nobackup       "no backup files
set nowritebackup  "only in case you don't want a backup file while editing
set noswapfile     "no swap files
set noundofile

set autoindent
set expandtab
set tabstop=4
set shiftwidth=4
set autoread
set autochdir

autocmd BufNewFile,BufRead *.csv   set filetype=csv_semicolon
autocmd BufNewFile,BufRead *.dat   set filetype=csv_pipe

" let g:plug_shallow = 0
call plug#begin('~/.vim/plugged')
" Plug 'mechatroner/rainbow_csv'
Plug 'prabirshrestha/vim-lsp'
Plug 'mattn/vim-lsp-settings'
Plug 'prabirshrestha/asyncomplete.vim'
Plug 'PProvost/vim-ps1'
Plug 'prabirshrestha/asyncomplete-lsp.vim'
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
Plug 'junegunn/fzf.vim'
Plug 'shime/vim-livedown'
call plug#end()

" Live down section reference

" launch the Livedown server and preview your markdown file
" :LivedownPreview

" stop the Livedown server
" :LivedownKill

" launch/kill the Livedown server
" :LivedownToggle

nmap mt :LivedownToggle<CR>

" End Live down section!

" < Other Plugins, if they exist >

" Plug 'fatih/vim-go'
"Plug 'neoclide/coc.nvim', {'do': 'yarn install --frozen-lockfile'}
"Plug 'dense-analysis/ale'
" call plug#end()


" Use the internal diff if available.
" Otherwise use the special 'diffexpr' for Windows.
if &diffopt !~# 'internal'
  set diffexpr=MyDiff()
endif
function MyDiff()
  let opt = '-a --binary '
  if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif
  if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif
  let arg1 = v:fname_in
  if arg1 =~ ' ' | let arg1 = '"' . arg1 . '"' | endif
  let arg1 = substitute(arg1, '!', '\!', 'g')
  let arg2 = v:fname_new
  if arg2 =~ ' ' | let arg2 = '"' . arg2 . '"' | endif
  let arg2 = substitute(arg2, '!', '\!', 'g')
  let arg3 = v:fname_out
  if arg3 =~ ' ' | let arg3 = '"' . arg3 . '"' | endif
  let arg3 = substitute(arg3, '!', '\!', 'g')
  if $VIMRUNTIME =~ ' '
    if &sh =~ '\<cmd'
      if empty(&shellxquote)
        let l:shxq_sav = ''
        set shellxquote&
      endif
      let cmd = '"' . $VIMRUNTIME . '\diff"'
    else
      let cmd = substitute($VIMRUNTIME, ' ', '" ', '') . '\diff"'
    endif
  else
    let cmd = $VIMRUNTIME . '\diff'
  endif
  let cmd = substitute(cmd, '!', '\!', 'g')
  silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3
  if exists('l:shxq_sav')
    let &shellxquote=l:shxq_sav
  endif
endfunction

git compare file in different branches

See here

The syntax is as follows

git difftool [| diff] branch1..branch2 -- <path/to/file/file_to_compare>

Example:

git difftool branch1..branch2 -- ./src/myfile.py

Clearing MEF Component cache

Download the "Clear MEF Component cache" extension as shown here if constantly seeing "Could not load file or assembly" when saving files in Visual Studio 2022.

Evite CSV import

The CSV has to be in the following format (pasted from reference link below):

  • Column A: First Name (and/or last name, plus any additional guest names if adding families under one contact).
  • Column B: Email address only (can be left blank if adding guests by phone instead).
  • Column C: Phone numbers only (can be left blank if adding guests by email instead).
  • No headers.
  • No special characters or symbols.
  • No additional columns filled in.

Sample:

Luke Skywalker,,111-111-1111
Han Solo,,999-999-9999
Chewbacca,,333-333-3333
Obi-Wan Kenobi,,222-222-2222

Reference

Recovering flash drive after using Balena Etcher

Summary:

list disk
select disk N # make sure you select the right one from the listing
clean # cleans the disk

"Add a partition back to it and format it, so that it acts like a normal storage device. Do the following"

create partition primary
select partition 1
format quick

Reference

Typst snippets for VSCode

{
	// Place your snippets for typst here. Each snippet is defined under a snippet name and has a prefix, body and 
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the 
	// same ids are connected.
	// Example:
	// "Print to console": {
	// 	"prefix": "log",
	// 	"body": [
	// 		"console.log('$1');",
	// 		"$2"
	// 	],
	// 	"description": "Log output to console"
	// }

	"AddFigure": {
		"prefix": "addfig",
		"body" : [
			"#figure(image(\"$1\",width:70%),caption:[$2])"
		],
		"description": "Add figure to typst document"
	},
     "AddTable": {
        "prefix": "addtable",
        "body": [
            "#table(columns: (auto,auto)",
            "table.header([*$1*],[*$2*])", 
            "[$3], [$4])"
        ],
        "description": "Add table to typst document"
    }
}

GNOME Tweaks app

Gnome tweaks is a handy app to quickly set appearance and other settings in Ubuntu (works as of Noble)

To install: sudo apt install gnome-tweaks To run: Type in gnome-tweaks in terminal

Powershell Notes

Get names of all directories in current script root:

$dirs = Get-ChildItem $PSScriptRoot |
       Where-Object {$_.PSIsContainer} | # analog of `.Where` Linq function in C#
       Foreach-Object {$_.Name} # analog of `.Select` Linq function in C#

Reference: here

Visual Studio Code vim bindings quickstart Notes

{
    "editor.fontSize": 16,
    "vim.insertModeKeyBindings": [
     {
         "before": ["j", "k"],
         "after": ["<esc>"]
     },
    ],
    "vim.useSystemClipboard": true,
    "vim.useCtrlKeys": false,

    
}

Powershell remote execution with parameters

Invoke-Command -ComputerName "computer-name" -FilePath "path\to\local\script.ps1" -ArgumentList "Argument1","Argument2"

Sample script.ps1

param (
  [Parameter(Position=0)][string]$param1,
  [Parameter(Position=1)][string]$param2
)

Write-Output "Param1: $param1, Param2: $param2"

FFMpeg stitch videos together

To concatenate videos without re-encoding:

/Applications/ffmpeg -f concat -safe 0 -i ./all.txt -c copy entire.mp4

Contents of all.txt:

file './C0043.MP4'
file './C0044.MP4'

Command to create compressed MP4:

ffmpeg -i entire.mp4 -vcodec libx265 -crf 28 output.mp4

ImageMagick Notes

  • To make a .ico file from a PNG:

convert -background transparent "icons8-bot-48.png" -define icon:auto-resize=16,24,32,48,64,72,96,128,256 "bot.ico"

  • To remove background:

Using extern C in C++

In C++, when using C libraries (with source code) do the following in the header file that is being #included

#ifdef __cplusplus
extern "C"
{
#endif

//content of header file

#ifdef __cplusplus
}
#endif

Git Credential Manager

To use Git Credential Manager, make sure the following is set in the global .gitconfig:

[credential "https://github.com"]
	helper = manager

Inf2Cat tool

This tool is used to create a .cat file for PnP drivers that need a detached signature.

Workflow:

  1. Use Inf2Cat to create a .cat file
  2. Sign the driver .sys file using signtool
  3. The .cat file must be referred to by the .inf file
  4. Keep the .cat, .sys, and the .inf files in the same directory
  5. Use pnputil and the .inf file to install the driver
"C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x86\Inf2Cat.exe"
Version 1.0.0.0
Runs driver signability tests and creates the catalog(s).

INF2CAT /driver:path /os:operatingSystem1[,os2]...
        [/nocat] [/verbose]
        [/drm[:file1[,file2]...]]
        [/pe[:file1[,file2]...]]
        [/pageHashes[:file1][,file2]...]]

  /driver (/drv)    Indicates the path to the driver package follows.

  path              Specifies the path to the driver package.

  /os               Indicates the operating system(s) targeted by the driver
                    package follows. The targeted operating system(s) is a
                    comma separated list of the following values:

  operatingSystem1  2000

                    XP_X86           Server2003_X86
                    XP_X64           Server2003_X64
                                     Server2003_IA64

                    Vista_X86        Server2008_X86
                    Vista_X64        Server2008_X64
                                     Server2008_IA64

                    7_X86
                    7_X64            Server2008R2_X64
                                     Server2008R2_IA64

                    8_X86
                    8_X64            Server8_X64
                    8_ARM

                    6_3_X86
                    6_3_X64          Server6_3_X64
                    6_3_ARM

                    10_X86
                    10_X64           Server10_X64
                                     Server10_ARM64

                    10_AU_X86
                    10_AU_X64        Server2016_X64

                    10_RS2_X86
                    10_RS2_X64

                    10_RS3_X86
                    10_RS3_X64
                    10_RS3_ARM64
                    10_RS4_X86
                    10_RS4_X64
                    10_RS4_ARM64
                    10_RS5_X86
                    10_RS5_X64       ServerRS5_X64
                    10_RS5_ARM64     ServerRS5_ARM64
                    10_19H1_X86
                    10_19H1_X64
                    10_19H1_ARM64
                    10_VB_X86
                    10_VB_X64
                    10_VB_ARM64
                    ServerFE_X64
                    ServerFE_ARM64
                    10_CO_X64
                    10_CO_ARM64
                    10_NI_X64
                    10_NI_ARM64
                    10_GE_X64
                    10_GE_ARM64
                    Server2025_X64
                    Server2025_ARM64

Check if Virtualization Based Security is enabled

/// <summary>
/// Checks if Virtualization Based Security (VBS) is enabled
/// </summary>
/// <returns>TRUE if enabled, FALSE otherwise</returns>
bool IsVbsEnabled() {
	HKEY  hKey;
	DWORD dwValue = 0;
	DWORD dwType = REG_DWORD;
	DWORD dwSize = sizeof(DWORD);
	bool isEnabled = false;
	// Open the registry key
	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
		TEXT("SYSTEM\\CurrentControlSet\\Control\\DeviceGuard"),
		0,
		KEY_QUERY_VALUE,
		&hKey) == ERROR_SUCCESS) {
		if (RegQueryValueEx(hKey, TEXT("EnableVirtualizationBasedSecurity"), NULL, &dwType, (LPBYTE)&dwValue, &dwSize) == ERROR_SUCCESS) {
			if (dwValue == 1) {
				printf("Virtualization Based Security is enabled.\n");
				isEnabled = true;
			}
			else {
				printf("Virtualization Based Security is disabled.\n");
				isEnabled = false;
			}
		}
		else {
			printf("Couldn't read registry key, vbs must be disabled\n");
			isEnabled = false;
		}
		RegCloseKey(hKey);
	}
	else {
		printf("Error accessing registry key.\n");
		isEnabled = false;
	}
	return isEnabled;
}

Get location of executing assembly in C#

From here:

public static DirectoryInfo GetExecutingDirectory()
{
        var location = new Uri(Assembly.GetEntryAssembly().GetName().CodeBase);
        return new FileInfo(location.AbsolutePath).Directory;
}