Tero Keso TeroKeso

User Management in Linux

Adding and removing users on a Linux system is crucial for system administration. Typically, you start with just the root account, which has full control but can be risky. It's better to create standard users (with no admin rights) for common tasks. In order to execute commands with superuser privileges, you can either log in as a root user (sudo su , not recommended) or use sudo with your commands (recommended).

To perform admin tasks, Ubuntu has a tool called sudo, allowing you to run commands as other users, including administrators.

Create a New User.

You can use the useradd command to add a new user to the system.

Use curl to get the JSON response for the latest release
Use grep to find the line containing file URL
Use cut and tr to extract the URL
Use wget to download it

curl -s https://api.github.com/repos/jgm/pandoc/releases/latest \
| grep "browser_download_url.*deb" \
| cut -d : -f 2,3 \
| tr -d \" \

Complete solution for websites hosting

This gist contains example of how you can configure nginx reverse-proxy with autmatic container discovery, SSL certificates generation (using Let's Encrypt) and auto updates.

Features:

Automatically detect new containers and reconfigure nginx reverse-proxy
Automatically generate/update SSL certificates for all specified containers.
Watch for new docker images and update them.
Ban bots and hackers who are trying to bruteforce your website or do anything suspicious.

How to install game-porting-toolkit (aka proton for macOS)

What is this?

In the recent WWDC, Apple announced and released the "game porting toolkit", which upon further inspection this is just a modified version of CrossOver's fork of wine which is a "compatibility layer" that allows you to run Windows applications on macOS and Linux.

Why would I want this?

Playing Windows games on MacOS

Available Public Wildcard DNS Domains pointing to localhost (127.0.0.1)

It turns out that some kind hearted people already set up wildcard domains for you already. You can use any domain below and/or any subdomain of these and they currently resolve to 127.0.0.1 but could switch at any time to resolve somewhere else. Here's the list of ones I know about. Let me know if there are more!

localhost - It will always works. Do you know why? I hope so.
[*.]fuf.me - Managed by @fidian; it will always point to localhost for IPv4 and IPv6
[*.]fbi.com - 👏 👏 👏 👏 👏
[*.]localtest.me
[*.]127-0-0-1.org.uk
[*.]vcap.me

	## Download Go
	sudo wget --output-document /opt/go.tar.gz https://go.dev/dl/go1.22.0.linux-amd64.tar.gz

	## Remove Existing Go and Extract Downloaded Go
	sudo rm -rf /usr/local/go && sudo tar --directory /usr/local --extract --gzip --file /opt/go.tar.gz && sudo rm /opt/go.tar.gz

	## Delete Derp if there is & Recreate user for Derper
	sudo userdel -r derp & sudo useradd --system --create-home --home-dir /opt/derp --shell /bin/bash derp

	<#
	- BIOS of host machine also needs to be configured to allow hardware virtualization
	- Windows 10 Pro or otherwise is needed; Windows 10 Home Edition CANNOT get WSL
	- This gist WSLv2, but can use WSLv1 instead. I needed v1 as I run Windows 10 in a VM in Virtualbox.
	- WSLv2 has been giving me problems in Virtualbox 6.1, but WSLv1 works properly.
	- vbox has issues with the GUI settings when it comes to nested virtualization on certain systems,
	so run the following if needing to give a VM this enabled setting:

	VBoxManage modifyvm <vm-name> --nested-hw-virt on
	#>

	# the following two lines give a two-line status, with the current window highlighted
	hardstatus alwayslastline
	hardstatus string '%{= kG}[%{G}%H%? %1`%?%{g}][%= %{= kw}%-w%{+b yk} %n*%t%?(%u)%? %{-}%+w %=%{g}][%{B}%m/%d %{W}%C%A%{g}]'

	# huge scrollback buffer
	defscrollback 5000

	# no welcome message
	startup_message off

	> cd /Applications/VMware\ Fusion\ Tech\ Preview.app/Contents/Library/VMware\ OVF\ Tool
	> ./ovftool --acceptAllEulas /Users/$USER/Virtual\ Machines.localized/Windows\ 11\ 64-bit\ Arm\ 2.vmwarevm/Virtual\ Disk.vmx /Users/$USER/export.ova