Somajit SomajitDey

Heroku Bash How-to

Heroku offers PaaS with a generous free-tier of 550 hours/month without requiring any credit-card validation. Official support is for Node.js, Python, Go, Ruby etc. But what if you just need to run a bash script, may be a netcat based server? Or you simply need to serve a webpage over http or https, and all you know is bash? (Of course you can also use the free services of x10hosting.com for the latter.)

Here are some simple steps to deploy a bash-script at Heroku.

Open a Heroku account
Download the Heroku CLI
git init the directory that contains your bash script
heroku login

Making SSH server work in WSL2

Ref:

Steps:

Edit /etc/ssh/sshd_config as follows. Simply uncomment (remove #) the below lines and edit as needed.

	#!/usr/bin/env bash
	# Description: A simple way to generate 128-bit Universally/Globally Unique Identifiers in GNU/Linux
	# Usage: ./UUID-GUID.bash ["Any text you wanna put in"]
	# Remark: Perhaps the use of so many variables is overkill, but Hey! It's fun ;-)
	# Author: Somajit Dey <[email protected]> 2021

	user_element="${1}" # Passed by the user as parameter (optional)

	device_element="$(cat /sys/class/net/eth0/address)" # MAC address

	#!/usr/bin/env bash

	# Brief: Basic Proof-of-Work (PoW) with deterministic output for input string passed as parameter.
	# Usage: ./pow <text>
	# Ctrl+'\' (SIGQUIT) to check current nonce anytime
	# Output: Nonce and 00* SHA256-Hash
	#===================================================

	hash_of(){
	sha256sum <(echo "${1}") \| awk '{print $1}'

	#!/usr/bin/env bash
	# Creates strong password of any given width from any given text or master password
	# Usage: echo <a line of text> \| [SALT=<salt>] ./passgen [-p] [<width>]
	# Option: -p generates PIN instead of password
	# Default: width=8; SALT=somesalt
	# Author: Somajit Dey <[email protected]>
	# License: GNU GPLv2

	set -o noglob

	{
	"API": {
	"HTTPHeaders": {}
	},
	"Addresses": {
	"API": "/ip4/127.0.0.1/tcp/5001",
	"Announce": [
	"/ip4/147.75.80.110/tcp/4001/p2p/QmbFgm5zan8P6eWWmeyfncR5feYEMPbht5b1FW1C37aQ7y/p2p-circuit/p2p/12D3KooWDZBXcHq6t4XFqRFN9pk8nW3VsUmXnvPGV9uL29aeUZmd",
	"/ip4/147.75.195.153/tcp/4001/p2p/QmW9m57aiBDHAkKj9nmFSEn7ZqrcF1fZS4bipsTCHburei/p2p-circuit/p2p/12D3KooWDZBXcHq6t4XFqRFN9pk8nW3VsUmXnvPGV9uL29aeUZmd",
	"/ip4/147.75.70.221/tcp/4001/p2p/Qme8g49gm3q4Acp7xWBKg3nAa9fxZ1YmyDJdyGgoG6LsXh/p2p-circuit/p2p/12D3KooWDZBXcHq6t4XFqRFN9pk8nW3VsUmXnvPGV9uL29aeUZmd"

	#!/usr/bin/env bash
	# Brief: TODO list specific to git branches. No effect on commits, staged or worktree
	# Installation:
	# chmod +x ./git-todo
	# sudo mv ./git-todo /usr/local/bin
	# git config --global alias.todo '!git-todo'
	# Help: git todo -h
	# Author: Somajit Dey <[email protected]> 2021 [https://github.com/SomajitDey]
	# Source: https://gist.github.com/SomajitDey
	# GitHubGist Search Terms: username:SomajitDey filename:git-todo.bash

	#!/usr/bin/env -S gpg --batch --expert --gen-key
	# Brief: Generate ECC PGP keys for signing (primary key) & encryption (subkey)
	# Run as: chmod +x gpg_ecc-25519_keygen; ./gpg_ecc-25519_keygen
	# Ref: https://www.gnupg.org/documentation/manuals/gnupg/Unattended-GPG-key-generation.html

	%echo "Generating ECC keys (sign & encr) with no-expiry"
	%no-protection
	Key-Type: EDDSA
	Key-Curve: ed25519
	Subkey-Type: ECDH

	#!/usr/bin/env bash
	# Ref: https://unix.stackexchange.com/questions/159253/decoding-url-encoding-percent-encoding
	# Ref: https://github.com/sixarm/urldecode.sh

	input="${@//+/ }"
	echo -e "${input//%/\\x}"