Functions in Bash
This is the code for a function in Bash script. #!/bin/bash # Define a function greet() { echo “Hello, $1″ } # Call the function with “World” as the argument greet “World”
Archive for 'Computing Notes'
Looping through filenames in Bash
To loop through the subdirectories in a folder, when those subdirectories may contain spaces in the file names, use the following procedure. OLD_IFS=$IFS && IFS=$’\n’ for directory in $HOME/somefolder/*/; do echo “some code here” done IFS=$OLD_IFS
Bash and *nix Note no. 2
This document contains some notes on .bashrc for use with Linux systems. alias ll=’ls -alF’ alias la=’ls -A’ alias l=’ls –CF’ if [ -f ~/.bash_aliases ]; then . ~/.bash_aliases fi The preceding two blocks come standard on Ubuntu as of version 2022.04. One tweak for WSL2 on Windows might be the addition of this [...]
Bash and *nix Note no. 1
7 July 2023: Ubuntu 22.04′s update notifier seems to not include the option to configure any settings, at least after certain conditions exist on a particular system. To stop the notifier from appearing. To stop the notifier from appearing use sudo apt-get remove update-notifier 7 July 2023: There are non-snap builds of ungoogled-chromium for Ubuntu [...]
Minecraft Tweaks
To launch java -Xms2048M -Xmx2048M –add-modules=jdk.incubator.vector -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -jar server-1.21.1.jar nogui
T+n time series analysis
This isn’t stock advice, it’s a data and math project. AAPL is interesting (not investing advice!) from a data perspective. Part of my big data project was the creation of a tool to analyze every symbol regressed on every other symbol for numerous lags. In addition to revealing the vendor’s mangling of data for unknown [...]
Stata reference material
Linear regression analysis using Stata contains a look at Stata output for regression. There is also an excellent document on Regression Analysis | Stata annotated output at this link. There is an excellent document on Basic Data Analysis and Manipulation at this link. Yt−1 is the first lag of Yt (Chapter 10, p. 1).
Rudimentary versioning system
Some time ago, Python 2 was the default language for use with Linux and Gnome 3. A set of extensions for Gnome, called Nautilus Python existed which allowed one to create customized right click menus. One of these was called “Historical Copy” and it created a lovely copy of the file with a timestamp inserted [...]