Prototype-X

---
# You may override default target user with -e user=someotheruser
# It is mandatory to choose a strong password! At least consult with https://www.bennish.net/password-strength-checker/

- name: change linux user password
  hosts: [all]
  gather_facts: no
  vars_prompt:
## use this when 656K rounds will be OK for your servers' CPU performance, or when rounds number will become configurable in ansible
# You may need 'apt-get install python-passlib' or 'pip install passlib' for vars_prompt encryption

Prototype-X

#!/bin/bash

#This script will compile and install a static ffmpeg build with support for nvenc un ubuntu.
#See the prefix path and compile options if edits are needed to suit your needs.
#for ubuntu 19.04

#install required things from apt
installLibs(){
echo "Installing prerequisites"
sudo apt-get update

Prototype-X

# My tmux configuration, partly based on https://github.com/wbkang/wbk-stow/blob/master/tmux-config/.tmux.conf

# Scroll History
set -g history-limit 50000

# show messages for 4 seconds instead
set -g display-time 4000

# set first window to index 1 (not 0) to map more to the keyboard layout
set-option -g renumber-windows on

Prototype-X

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Prototype-X

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

Prototype-X

#!/usr/bin/env bash

# NOTE: This will let anyone who belongs to the 'pcap' group
# execute 'tcpdump'

# NOTE2: User running the script MUST be a sudoer. It is
# convenient to be able to sudo without a password.

sudo groupadd pcap
sudo usermod -a -G pcap $USER

Prototype-X

References:

• Ubuntu Community Wiki - PinningHowto
• Debian Wiki - AptPreferences

Overview

Priority values

From man page: man apt_preferences

Prototype-X

sudo dpkg-reconfigure wireshark-common #Select "Yes"
chmod +x /usr/bin/dumpcap
sudo setcap 'CAP_NET_RAW+eip CAT_NET_ADMIN+eip' /usr/bin/dumpcap
or
`sudo setcap 'CAP_NET_RAW+eip CAT_NET_ADMIN+eip' $(which dumpcap)'

Prototype-X

# local port forwarding
# the target host 192.168.0.100 is running a service on port 8888
# and you want that service available on the localhost port 7777

ssh -L 7777:localhost:8888 user@192.168.0.100

# remote port forwarding
# you are running a service on localhost port 9999 
# and you want that service available on the target host 192.168.0.100 port 12340

Prototype-X

Linux Magic System Request Key Hacks

Documentation for sysrq.c

What is the magic SysRq key?

It is a 'magical' key combo you can hit which the kernel will respond to
regardless of whatever else it is doing, unless it is completely locked up.