Kevin Ernst ernstki

[`perlrun`][1] whirlwind tour

Here are some [shebang (#!/path/to/interpreter) fun facts][2].

And why shebang? In music, '#' means sharp. So just shorten #! to sharp-bang. Or it might be derived from "shell bang". All this probably under the influence of the american slang idiom "the whole shebang" (everything, the works, everything involved in what is under consideration). See also the wiktionary, jargon dictionary or Merriam-Websters. Sometimes it's also called hash-bang, pound-bang, sha-bang/shabang, hash-exclam, or hash-pling (british, isn't it?).

According to Dennis M. Ritchie (email answer to Alex North-Keys) it seems it had no name originally.

And Doug McIllroy mentioned (TUHS mailing list), that the slang for # at Bell Labs most probably was "sharp" at the time.

Pretty-printing KeePass XML export files

First, create an XML export using [KeePass for Windows][kp]—not KeePassX, the export format is completely different.

Then add a line like:

	#!/usr/bin/env bash
	#
	# Script to query UCSC MySQL server for SNP coordinates (but could easily be
	# repurposed to query any arbitrary database/table)
	#
	# Author: Kevin Ernst
	# Date: 2 March 2019; updated 30 August 2021
	# Source: https://gist.github.com/ernstki/91b427d6714cdd4dd6560e5b4fb961f4
	# License: MIT
	#

	#!/usr/bin/env python
	"""
	pywhich - tell me where a Python package came from

	Original author: Adam Anderson
	Source: https://stackoverflow.com/a/42365058
	License: CC-BY-SA-4.0
	"""
	from __future__ import print_function

	#!/usr/bin/env bash
	##
	## generate mnemonic passphrases beginning with the given letters
	##
	## Author: Kevin Ernst
	## Date: 27 May 2021
	## License: MIT
	## Source: https://gist.github.com/ernstki/589bfb4adfb3869834c97bd106d58b7e
	##
	## Usage: pphrases a b c [...]

	#!/usr/bin/env bash
	##
	## scale the last screenshot on the desktop with ImageMagick
	##
	## Author: Kevin Ernst (ernstki -at- mail.uc.edu)
	## Date: 25 October 2020
	## Source: https://gist.github.com/ernstki/8776b3325f0a7abcc0d6080b2160a15c
	## License: MIT (https://choosealicense.com/licenses/mit)
	##
	## Installation:

	#!/usr/bin/bash
	# shellcheck disable=SC1117
	dsum ()
	{
	author 'Kevin Ernst'
	about 'sum up column COL over DEPTH levels of hierarchy'
	param '-d\|--depth DEPTH - summarize this many levels of hierarchy (default: 5)'
	param '-c\|--column COL - add up this column (default: 2)'
	param '-h\|--humanize - print byte sizes in "human" figures (K, M, G, etc.)'
	param '-F\|--separator - field separator (default: tab)'

	##
	## Take a file uploaded by the user, process it, and offer the result for
	## download
	##
	## For a more complete example (with better input checking), see:
	## https://flask.palletsprojects.com/en/1.1.x/patterns/fileuploads/
	##
	## Run like this:
	## $ mkdir uploads
	## $ FLASK_APP=flask-upload-download.py flask run

	#!/usr/bin/sed -nf
	##
	## parse a Windows-style .ini file into key-value pairs that can be 'eval'd
	## into a Bash associative array declaration
	##
	## Usage:
	## $ eval "declare -A cfg=( $(ini2assoc config.ini) )"
	## $ echo "section.keyname = ${cfg[section.keyname]}"
	##
	## Input:

	#!/bin/bash
	##
	## Reduce a PDFs byte size by using either grayscale images and/or
	## the '/ebook' output target of 'gs' (Ghostscript)
	##
	## Requires: Ghostscript probably 7.something or higher
	##
	## Author: Kevin Ernst
	## Date: ages ago
	##

Kevin Ernst ernstki

[perlrun][1] whirlwind tour

Pretty-printing KeePass XML export files

[`perlrun`][1] whirlwind tour