Install Java 21 in Debian 12

Minecraft Java edition lost compatibility with Java 17 between 1.20.4 and 1.20.6. Version 1.20.4 works with Java 17, and 1.20.6 no longer works with Java 17.  Several guides appear online for installing downloaded packages of the 64-bit runtime from Oracle or other sources.  Since Debian offers 32-bit server operating systems in the present day, the package manager versions are the easiest option if one uses the 32-bit version of Debian.  One of the reasons to use the 32-bit version of Debian is for use with older versions of Minecraft such as 1.10 and 1.12.  The older versions’ ecosystem contain an incredible number of mods.  The older versions require 32-bit java runtimes and the easiest way to handle that is to use a 32-bit operating system and then one can have newer versions of Java alongside older versions of Java and then one can run any version of Minecraft and Minecraft Forge that they desire.

Edit /etc/apt/sources.list to contain the following lines:

deb http://deb.debian.org/debian testing main
deb-src http://deb.debian.org/debian testing main

Then, run the following commands.

apt-get update
apt-get install openjdk-21-jre
java –version

https://wiki.debian.org/DebianTesting contains a good reference guide for using Debian Testing, including details on upgrading to the next distribution.  The approximate Java lifecycle can be found at https://www.oracle.com/java/technologies/java-se-support-roadmap.html.

Posted in Computing Notes | Tagged , , , | Comments closed

Hypothesis test memo no. 1


1. R2 is the coefficient of determination, which is the square of the Pearson correlation coefficient, r, the formula for which is ρ=β1(σx/σy), where β1 is the parameter estimate. ASCI and Unicode text does not have a circumflex, ^, on top of the β. For this documentation the objective is multiplatform long-term readability so an equation editor with specialized support for circumflexes is out of the question.

2. There is also the existence of the rejection region method. We reject the null hypothesis if the test statistic’s absolute value is greater than the critical value, which we can express with the formula Reject if |t| > tα/2,n-1

Posted in Social Science notes | Tagged , | Comments closed

Disable updates in Thunderbird

Open the Thunderbird program folder (e.g. C:\Program Files (x86)\Thunderbird)
create a new folder named distribution
Create a file named policies.json with the following content:

 

{
    "policies": {
    "DisableAppUpdate": true
    }
}

Thanks to sifferedd.

Posted in Computing Notes | Tagged , | Comments closed

Print environmental variables in Bash

Use printenv to see what environment variables are set.

#!/usr/bin/env bash
printenv
    set -x
Posted in Computing Notes | Tagged , | Comments closed

.nanorc in CentOS

Edit $HOME/.nanorc to contain the following:

include /usr/share/nano/java.nanorc
include /usr/share/nano/man.nanorc
include /usr/share/nano/nanorc.nanorc
include /usr/share/nano/python.nanorc
include /usr/share/nano/sh.nanorc
include /usr/share/nano/html.nanorc
include /usr/share/nano/perl.nanorc
include /usr/share/nano/php.nanorc

CentOS 7 uses a much older version of nano than the one that presently ships on most distributions. The php.nanorc on newer The following should appear in /usr/share/nano/php.nanorc on CentOS7 to allow syntax highlighting for php:

 

## Syntax highlighting for PHP

syntax "php" "\.(php[23457s~]?|phtml|ctp)$"

# PHP markings.
color brightgreen "()"

# Function names.
color white "\
Posted in Computing Notes | Tagged , , | Comments closed

The .bashrc file I use on CentOS6

The .bashrc file I use on CentOS6

 

# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

# system variables
export VISUAL=nano  # sets nano as the crontab editor
export GZIP=-9      # maximum compression
export XZ_OPT=-9    # maximum compressions

# ls modifications
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'

# calculator
calc() { echo "$*" | bc -l; }

# Generate a UUID
uuid() { UUID=$(cat /proc/sys/kernel/random/uuid) && echo $UUID; }

# CHANGE SHELL/WINDOW TITLE
# Works on Opensuse 15.3
# PS1=$PS1"\[\e]0;test1\a\]"
shellrename() { read -p "Enter new shell name: " name && PS1=$PS1"\[\e]0;${name}\a\]"; }

# For older versions of gnome-terminal
# shellrename() { read -p "Enter new shell name: " name && PROMPT_COMMAND='echo -ne "\033]0;${name}\007"'; }

# Zen Burn
# Another old way that works great in gnome-terminal while causing problems
# in some configurations involving SSH:
echo -ne '\e]12;#BFBFBF\a'
echo -ne '\e]10;#DCDCCC\a'
echo -ne '\e]11;#3F3F3F\a'
echo -ne '\e]4;0;#3F3F3F\a'
echo -ne '\e]4;1;#705050\a'
echo -ne '\e]4;2;#60B48A\a'
echo -ne '\e]4;3;#DFAF8F\a'
echo -ne '\e]4;4;#506070\a'
echo -ne '\e]4;5;#DC8CC3\a'
echo -ne '\e]4;6;#8CD0D3\a'
echo -ne '\e]4;7;#DCDCCC\a'
echo -ne '\e]4;8;#709080\a'
echo -ne '\e]4;9;#DCA3A3\a'
echo -ne '\e]4;10;#C3BF9F\a'
echo -ne '\e]4;11;#F0DFAF\a'
echo -ne '\e]4;12;#94BFF3\a'
echo -ne '\e]4;13;#EC93D3\a'
Posted in Computing Notes | Tagged , , | Comments closed

The best Alias for ls

The best alias for ls is

ls –halF

It is easy to remember, and produces easy to read output with human readable file sizes and / marks present by the directory names..

Posted in Computing Notes | Tagged , | Comments closed

Install iftop on Oracle Linux 9

dnf install oracle-epel-release-el9
dnf install iftop

iptraf is already in the default repositories.

Posted in Computing Notes | Tagged , , , , | Comments closed

A good version of ll

A really good version of the ll alias is:

ls –lahF, although on some versions ls –lahp looks better than F.

Posted in Computing Notes | Tagged , | Comments closed

LS alias and Mozilla DRM bar

Some useful aliases that are not always preconfigured on every Linux version:

alias ll=’ls -alF’
alias la=’ls -A’
alias l=’ls –CF’

To eliminate the DRM warning in Firefox and Librewolf without enable DRM, add this to “userChrome.css”:

 notification[value="drmContentDisabled"]{ display:none !important; }

toolkit.legacyUserProfileCustomizations.stylesheets must be set to true in about config.

Posted in Computing Notes | Tagged , , | Comments closed