AfroThundr3007730

#!/bin/bash
# Imports DoD root certificates into Linux CA store
# Version 0.4.1 updated 20241216 by AfroThundr
# SPDX-License-Identifier: GPL-3.0-or-later

# For issues or updated versions of this script, browse to the following URL:
# https://gist.github.com/AfroThundr3007730/ba99753dda66fc4abaf30fb5c0e5d012

# Dependencies: curl gawk openssl unzip wget

0xSheepdog

CIDR SUBNET MASK CHEATSHEET & ICMP TYPE CODES
https://oav.net/mirrors/cidr.html
_____________________________________________________________________________

Netmask              Netmask (binary)                 CIDR     Notes    
_____________________________________________________________________________
255.255.255.255  11111111.11111111.11111111.11111111  /32  Host (single addr)
255.255.255.254  11111111.11111111.11111111.11111110  /31  Unuseable
255.255.255.252  11111111.11111111.11111111.11111100  /30    2  useable
255.255.255.248  11111111.11111111.11111111.11111000  /29    6  useable

holmberd

Kill user tty/pts sessions in Linux

Commands

• w: show who is logged on and what they are doing
• who: show who is logged on
• tty: show current users pseudo terminal
• ps -ft pts/1: get process id for the pseudo terminal
• pkill: signal process based on name and other attributes

magnetikonline

Add user ssh-agent as daemon to Ubuntu 18.04LTS server

Create a new systemd user unit, which starts ssh-agent upon login to server. Will remain resident until the final session for the user has logged out.

Steps

• Create /etc/systemd/user/ssh-agent.service.

• Run the following commands (under your user account, not root) to install the systemd unit and start:

aojea

#!/bin/bash

set -xe
# This script takes as a parameter the name of the VM
# and creates a linked clone
# Ref: https://unix.stackexchange.com/a/33584
# The scripts assumes that it runs from the same folder 
# where the vm image is located and it coincides with the 
# image name

ferry77

#   +-------+       +----------+      +-----------+
#   | Laptop| <---> | Jumphost | <--> | FooServer |
#   +-------+       +----------+      +-----------+

Host JumpHost
  User ec2-user
  HostName xx.xx.xx.01    
  # Add these 2 lines so we don't have to manually run 'ssh-add [key]'
  UseKeychain yes
  AddKeysToAgent yes

alces

• using Ansible command line:

ansible-playbook --connection=local 127.0.0.1 playbook.yml

• using inventory:

127.0.0.1 ansible_connection=local

tuxfight3r

#Read multiple keys from an authorized_keys file and print the finger print

[root@server01 .ssh]# while read line; do ssh-keygen -l -f /dev/stdin <<< $line; done < authorized_keys 
2048 87:7a:4d:70:d2:10:a4:4b:b7:e1:2b:7c:77:92:25:04 /dev/stdin (RSA)
2048 7d:f0:89:94:00:09:bc:70:46:59:8d:9a:70:3b:ac:70 /dev/stdin (RSA)
2048 61:63:ee:0d:f6:d2:d8:d6:ae:37:0c:35:ae:da:51:6a /dev/stdin (RSA)

#read a key from authorized key file
[root@server01 .ssh]# ssh-keygen -l -f authorized_keys 
2048 87:7a:4d:70:d2:10:a4:4b:b7:e1:2b:7c:77:92:25:04 authorized_keys (RSA)

afair

==========================================          ==========================================
             TMUX COMMAND                                        WINDOW (TAB)
==========================================          ==========================================

List    tmux ls                                     List         ^b w
New          new -s <session>                       Create       ^b c
Attach       att -t <session>                       Rename       ^b , <name>
Rename       rename-session -t <old> <new>          Last         ^b l               (lower-L)
Kill         kill-session -t <session>              Close        ^b &