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Rust Crash Course

N. P. O'Donnell, 2020 - 2023

Commands

rustup (Rust updater)

Show rustup version (not Rust version):

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#!/usr/bin/env sh
# rename-repo
# Renames a named git repo on the server side
# N. P. O'Donnell, 2020

REPO_BASE=/git
REPO_OLD_NAME=$1
REPO_NEW_NAME=$2
REPO_OLD_DIR=$REPO_BASE/$REPO_OLD_NAME.git
REPO_NEW_DIR=$REPO_BASE/$REPO_NEW_NAME.git

npodonnell

Docker Compose Cheatsheet

N. P. O'Donnell, 2020

Facts about Docker Compose

• Docker Compose is not a part of Docker
• Consists of 2 parts: CLI and .yaml files
• Deals in services (a service is comprised of several containers)
• Default compose file is docker-compose.yml but any filename may be used
• First line of compose file is version, but compose file version does not correspond to docker compose version.

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Docker Ubuntu Setup

N. P. O'Donnell, 2020

Preparing a Ubuntu host for docker. Ensures an nginx image can run on port 80.

Install docker:

sudo apt-get update
sudo apt-get install docker.io

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Docker Cheatsheet

N. P. O'Donnell, 2020

Files & Directories

• Containers are stored in /var/lib/docker/containers
• Easiest to use su first if snooping around /var/lib/docker
• Each container has a config.v2.json config file

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#!/usr/bin/env sh
# make-repo
# Creates a bare, named git repo on the server side
# N. P. O'Donnell, 2020 - 2021

REPO_BASE=/git
REPO_NAME=$1
REPO_DIR=$REPO_BASE/$REPO_NAME.git
HOSTNAME=$(hostname)

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GNU Octave Cheatsheet

Math

Simple Math

>> 1+2
ans =  3
>> 3-1
ans =  2
>> 4*5

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Gradle Cheatsheet

Initalize Gradle in Root Dir (similar to git init):

gradle init

this will create some files:

• build.gradle -- Gradle build script
• settings.gradle -- Gradle settings script

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Bitcoin Core Codebase Notes

Transaction Signing

MutableTransactionSignatureCreator (src/script/sign.cpp) seems to be where the sighash is created. There is one constructor which takes a transaction (txToIn), an input index (nInIn), and amount, and a sighash type (eg. SIGHASH_ALL).

https://github.com/bitcoin/bitcoin/blob/master/src/script/sign.cpp#L28

https://github.com/bitcoin/bitcoin/blob/master/src/script/interpreter.cpp#L1234

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Monitor outgoing DNS traffic:

```
tcpdump -vvAs0 port 53
```