ivermac

Recently (well a couple of hours ago 😆) I installed Ubuntu 22.04 on my WSL2 but I misspelled my username and I had to ( wanted to is more accurate 😆) change to my preferred username. I got all my insights from here and here.

 wsl -d ubuntu-22.04 -u root usermod -l <new-username> <old-username>
 wsl -d ubuntu-22.04 -u root groupmod -n <new-groupname> <old-groupname>
 wsl -d ubuntu-22.04 -u root usermod -d /home/<new-home-directory> -m <new-username>

I got excited this worked the first time and I wanted to write about it 😄

ivermac

ABOUT

about:config settings to harden the Firefox browser. Privacy and performance enhancements.
To change these settings type 'about:config' in the url bar. Then search the setting you would like to change and modify the value. Some settings may break certain websites from functioning and rendering normally. Some settings may also make firefox unstable.

I am not liable for any damages/loss of data.

Not all these changes are necessary and will be dependent upon your usage and hardware. Do some research on settings if you don't understand what they do. These settings are best combined with your standard privacy extensions (HTTPS Everywhere, NoScript/Request Policy, uBlock origin, agent spoofing, Privacy Badger etc), and all plugins set to "Ask To Activate".

ivermac

let username = 'john';
let password = 'doe';
let url = `https://httpbin.org/basic-auth/${username}/${password}`
let authString = `${username}:${password}`
let headers = new Headers();
headers.set('Authorization', 'Basic ' + btoa(authString))
fetch(url,{method: 'GET', headers: headers})
    .then(function (response) {
 console.log (response)

ivermac

check diskspace ubuntu

sudo fdisk -l

sudo lsblk

check files and directories size in a directory in ubuntu

ll --block-size=M

du -hc | sort -rh | head -20

ivermac

 # Check existing
 - name: Ansible check file exists.
    stat:
      path: /etc/filename
    register: file_status
  - debug:
      msg: "File exists..."
    when: file_status.stat.exists
  - debug:
      msg: "File not found"

ivermac

List gpg keys:

gpg --list-keys --keyid-format LONG

Search key in key server:

gpg --search <email>

ivermac

I'm a mac user and I use crontab -e to render the crone job editor. I added comments that help me remember the cron job pattern/format.

# |minute (0 - 59)
# |
# | |hour (0 - 23)
# | |
# | | |day of month (1 - 31)
# | | |

ivermac

To generate random values for secret keys

import os
os.urandom(24).encode('hex')

To view hidden attribute of an object

object._className__attrName

ivermac

Killing pm2 god daemon

ps aux | grep -i pm2 | grep <user> | grep -v grep | awk '{print $2}' | xargs kill -9

A small alteration from the github solution given here

ivermac

Found clojure type reflection useful when using java objects in clojure. Especially in the repl

(use 'clojure.pprint 'clojure.reflect)
(def object-members (:members (reflect <object>)))
(print-table [:name :type :flags] (sort-by :name object-members))

The official documentation is here