Ewald Benes ewaldbenes

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ewaldbenes / firebase-csv-user-import.ts

Created December 4, 2018 10:15

Firebase user import from CSV using admin tools and RxJs

	/**
	* Written in Typescript (v3+).
	*
	* Dependencies:
	* - rxjs >= 6
	* - firebase-tools >= 6
	*
	* Have fun!
	*
	*/

ewaldbenes / file_entropy.py

Created December 8, 2018 13:07

Calculate Shannon entropy of a file to show randomness of contained data. Can give hints if a file is compressed or encrypted. Entropy of 0 means all data is equal hence no randomness at all. 8 means perfect randomness which is the mathematical limit.

	# file_entropy.py
	#
	# Shannon Entropy of a file
	# = minimum average number of bits per character
	# required for encoding (compressing) the file
	#
	# So the theoretical limit (in bytes) for data compression:
	# Shannon Entropy of the file * file size (in bytes) / 8
	# (Assuming the file is a string of byte-size (UTF-8?) characters
	# because if not then the Shannon Entropy value would be different.)

ewaldbenes / trim-icalendar-ics

Last active October 4, 2024 22:17

Removes all events preceeding a given year and month from an .ics calendar file.

	#!/bin/bash

	# Usage: ./trim-icalendar-ics foo-bar.ics 2024 06
	# Removes all events before 2024 and month May (or keeps everything from May 2024 onwards)
	# and saves the remaining events into the file foo-bar.ics.out

	# Note: current working directory must be the one where the ics file resides!

	# Note for Mac and BSD users: this script requires the GNU version of csplit and sed!