porteusconf porteusconf

Use-case: Laptop running debian-flavor linux is connected to HP-Laserjet by ethernet, and the printer is automatically shared to wifi with no interaction by laptop user; i.e. laptop is a stand-alone single printer print server. Printer never can see internet, and is shared only to local wifi subnet.

When I connected my old HP LaserJet P2055dn by usb to my debian laptop, it automatically shared it (as I told cups to share printers) But cups-browsed and/or avahi told cups to use a postscript driver, which did not work very well. However, when Iuse avahi to get model of printer, then lpinfo and grep finds the pcl3 driver I need for my particular printer. YMMV...

lpinfo -m | grep -i "HP LaserJet P2055dn"
drv:///hpcups.drv/hp-laserjet_p2055dn-pcl3.ppd HP LaserJet p2055dn pcl3, hpcups 3.22.10

So, I needed a script to tell cups to use the pcl3 driver instead of postscript. While I was at it, I would rather the connection from the laptop to the printer be by ethernet cable instead of usb but still have p

Stop audit from spamming dmesg by adding audit=0 to kernel params in *.conf file in /boot/loader/entries/

cd /boot/loader/entries/
sudo nano <the conf file?  ### add " audio=0 " after  "loglevel=0" so it says:
$ head -3 *.conf
title Endless OS 6.0.8 (ostree:0)
version 1
options rw splash plymouth.ignore-serial-consoles quiet loglevel=0 audit=0 ostr...

How I backup/restore my chromebrew setup and manually-installed items in /usr/local/bin by using group

In dev mode chromeos, most mounts are noexec except /usr/local so that is why executeables are in /usr/local/bin Almost everything in my /usr/local was installed by chromebrew (crew) except a few items I manually copied to /usr/local/bin

As a way to tag items I manually added, I change the group from chronos to some other group and I chose midis which seems safe. So for example, I like to keep a non-executeable list of what crew has installed in /usr/local/bin

crew list installed > /usr/local/bin/crew-list-installed.txt

I also sometimes manually install in /usr/local/bin some *.sh or a few binaries crew does not (yet) provide, like btm.

Better than forked gist here is Alternative method below...

#!/bin/bash

URLs=$(curl "https://dl.google.com/dl/edgedl/chromeos/recovery/cloudready_recovery2.json" \
-s --output - | \
grep "^.*\"url\".*$" | \
sed "s/.*\"url\": \"\(.*\)\".*$/\1/g")

printf "\nPick which channel to download your image from. Channel name is near the end of the URL.\n\n"

	### chromeos has storage_test_1 and storage_test_2 to test drive (sdd or hdd)
	### Hit ctrl-alt-T then at crosh prompt type:

	crosh> storage_test_1 --help
	storage_test_1
	Performs a short offline SMART test.(Always takes just 1 minute.)

	crosh>
	Welcome to crosh, the ChromeOS developer shell.

	### https://marcelotduarte.github.io/cx_Freeze/
	### https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/
	python3 -m venv .venv
	source .venv/bin/activate
	pip install --upgrade cx_Freeze

	### for appimage https://cx-freeze--2050.org.readthedocs.build/en/2050/setup_script.html#bdist-appimage

	#!/bin/sh
	echo "for each ping that fails, adds one line to csv log file with iso-8601 date and host"
	echo "Usage: ./pinglog.sh host-to-ping i.e. ./pinglog.sh google.com "
	# to do: if continually fails, don't log each failure, just start and stop of failures.
	# i guess something like if previous fail was less than X secs from current, don't log.
	while true ;
	do
	# change -I arg from wlan1 to whatever interface you want to use
	ping -c1 -I wlan1 $1 > /dev/null
	### ping -n 1 $1 > /dev/null ### for windows with gitbash (see comment below)

	## In 2022 I bought a 1tb used SSD on ebay. I needed to add two lines to drivedb.h so smartctl would find it info for it:
	cat << EOF
	### Add two lines to drivedb.sh shown with (+) in diff output below.
	### after adding the 2 lines, your diff output should be similar
	### bash-3.2$ diff -C drivedb-oem.h drivedb-owc.h

	"OWC Aura Pro( 6G SSD)?\|" // tested with OWC Aura Pro 6G SSD/507ABBF0, OWC Aura Pro/603ABBF0
	"OWC Mercury Electra (Pro )?[36]G SSD\|" // tested with
	// OWC Mercury Electra 6G SSD/502ABBF0, OWC Mercury Electra Pro 3G SSD/541ABBF0
	+ "OWC Mercury Extreme Pro 6G\|" // tested with

	echo " reinstall all patches and rebuild kext first. I did not reboot. YMMV "
	open /Applications/Utilities/Patch\ Updater.app
	echo " warning... this will delete all chome profiles! You'll have to sign in and re-sync."
	mv ~/Applications/Chrome\ Apps.localized/ /tmp/
	mv ~/Application\ Support/Google/ /tmp
	mv ~/Library/Google /tmp
	rm -rf /Library/Google
	rm -rf /Library/Application\ Support/Google

	/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --disable-gpu chrome://extensions

	#!/bin/zsh
	# Based on https://indiespark.top/software/detecting-apple-silicon-shell-script/
	arch_name="$(uname -m \| cut -c 1-3)" # x86 or arm (to match arm64 or arm64e)
	echo -n ${arch_name} "= specifically "
	uname -m
	if [ "${arch_name}" = "x86" ]; then
	if [ "$(sysctl -in sysctl.proc_translated)" = "1" ]; then
	echo "Running on Rosetta 2"
	else
	echo "Running on native Intel"