J. Elliot Taylor jaytaylor

Bash shell skeleton programming snippets

Quick references to common and useful bash programming snippets and boilerplate.

URL shortener Base-62 encoder / decoder C++ Proof-of-Concept

Date: 2019-07-08

Purpose: Created as a C++ reference for SO: How do I create a URL shortener?.

How to use

Problem Statement

I've been hitting cases where kubernetes cluster actions are blocked due to priorityClass being absent after a helm install --upgrade.

For example:

  Type     Reason        Age                  From                    Message
  ----     ------        ----                 ----                    -------
  Warning  FailedCreate  3m (x1405 over 11h)  statefulset-controller  create Pod elasticsearch-data-2 in StatefulSet elasticsearch-data failed error: pods "elasticsearch-data-2" is forbidden: no PriorityClass with name elasticsearch-data was found```

	#!/usr/bin/env bash

	set -o errexit
	set -o pipefail
	set -o nounset

	for f in $(find . -name '*.java'); do
	perl \
	-0 \
	-i \

	#!/usr/bin/env bash

	##
	#
	# @author Jay E. Taylor <[email protected]>
	#
	# @description Math functions for bash!
	#
	##

	/**
	* dircnt.c - a fast file-counting program.
	*
	* Written 2015-02-06 by Christopher Schultz as a programming demonstration
	* for a StackOverflow answer:
	* https://stackoverflow.com/questions/1427032/fast-linux-file-count-for-a-large-number-of-files/28368788#28368788
	*
	* This code is licensed under the Apache License 2.0. Please read the file
	* LICENSE for more information.
	*

	package main

	// Also see the Python version: https://gist.github.com/jaytaylor/76de9c99acbfac637e68f78809dbd27e

	import (
	"bytes"
	"crypto/md5"
	"encoding/base64"
	"fmt"
	"io"

	#!/usr/bin/python
	# -- coding: utf-8 --

	"""
	@author Jay E. Taylor <[email protected]>

	@date 2019-06-03

	@description MD5 hash calculator for multi-part file uploads to S3 / object storage.

-#!/usr/bin/env bash
-#
-# @author Jay Taylor [jaytaylor.com](https://jaytaylor.com)
-#
-# @date 2019-03-04
-#
-# Sometimes Kubernetes seems to get stuck and doesn't
-# delete the contents of a namespace from my cluster after
-# `kubectl delete namespace X` has been run.

	#!/usr/bin/env python
	# -- coding: utf-8 --

	"""
	Removes a file or directory while preserving the modification time (mtime) of
	the parent directory.

	Pure-python implementation.

	See also: