henri

# show the limits in place on the system 
ulimit -a

# system wide ulmits 
ulimit -Sn  # soft limit
ulimit -Hn  # hard limit

# list open files for all processes and sort them by how many files are open
for pid in /proc/[0-9]*; do echo "PID = $(basename $pid) : $(ls $pid/fd 2>/dev/null | wc -l) open files"; done | sort -n -k5,5

henri

preview / quicklook systems 

# nemo 
sudo apt install nemo-preview ffmpegthumbnailer tumbler

# nutilus
sudo apt install gnome-sushi 

henri

# install on debian dirivitve (commdn line program)
sudo apt install dict dictd dict-gcide dict-wn

# look up english word 
dict "word"

# lookup word just int he collabrative internation dictonary of Ensligh
dict -d gcide "hello"

henri

#!/bin/bash
#
# (C)Copyright 2025 
# Henri Shustak
# Released Under the MIT licence
#
# Script which takes text via standard in and generates an audio file and then plays that audio file.
# Text to speach is processed via elevenlabs.io API. You will require a  API Key to get a valid response
#
# Usage : echo "hello, this is the text to speach system talking to you." | ~/bin/txt-2-speech-english.bash

henri

# list audio soruces # look for .minitor
pactl list short sources

# record in flac
parecord --channels=2 --file-format=flac --device=your.monitor output.flac

# play back flac
parecord -play output.flac

# play back with play

henri

#
# ssh using the -N falg for establishing a tunnel is great.... but somtimes it is difficult to know if authentication has 
# been successful (especially if you have any kind of extended login delays setup on a remote system) and you are
# authenticating with a password (did I type that correctly).
#
# this approach requires little additional setup and prevents lots of verbosity regarding the login.
#

# recive notification that authentication succeeded - bash
ssh -v <user>@<remote-host> -p <port> -L <localport>:<tunnel-host>:<remoteport> -N 2> >(grep Authenticated >&2)

henri

Screen Quick Reference

Basic

Description	Command
Start a new session with session name	screen -S <session_name>
List running sessions / screens	screen -ls
Attach to a running session	screen -x
Attach to a running session with name	screen -r

henri

# reload hyperland configuration
hyprctl reload

henri

#!/usr/bin/env bash
PATH=/bin:/usr/bin
#
# (C)Copyright 2025 Henri Shustak
#
# Licence : GNU GPLv3 or later 
# https://www.gnu.org/licenses/gpl-3.0.html
#
#
# About : Check if a specific port is up or down on a specific host

henri

def calculate_area(width, height)
  raise TypeError, "Width must be a number" unless width.is_a?(Numeric)
  raise TypeError, "Height must be a number" unless height.is_a?(Numeric)

  raise ArgumentError, "Width must be positive" unless width > 0
  raise ArgumentError, "Height must be positive" unless height > 0

  width * height
end