gregjhogan

# python3-openssl is broken on ubuntu 20.04 (incompatible with python3-cryptography)
# remove these apt packages without removing their dependencies
# install latest version of these packages into system python
# then after re-installing the apt packages the pip installed packages are still used
sudo apt-get install -y python3-pip
sudo dpkg -r --force-depends python3-openssl python3-cryptography
sudo pip3 install pyopenssl cryptography
sudo apt-get install -y --fix-missing python3-openssl python3-cryptography

gregjhogan

sudo systemctl stop nvidia-persistenced.service
# only works if nothing is using the GPU
sudo rmmod nvidia_drm nvidia_uvm nvidia_modeset nvidia
nvidia-smi

gregjhogan

sudo apt-get install -o Debug::pkgProblemResolver=true -o Debug::Acquire::http=true --no-install-recommends nvidia-driver-520

gregjhogan

USB_DEV=/dev/sdX # replace X with correct number
USB_MNT=/mnt/usb

sudo mkdir -p /mnt/usb
sudo wipefs -a --force $USB_DEV
sudo dd if=/dev/zero of=${USB_DEV} bs=1M count=100
(
echo n # new partition
echo 1 # partition number 1
echo 2048 # first sector 2048

gregjhogan

USB_DEV=/dev/sdX # replace X with actual device name
USB_MNT=/mnt/usb
ROOT_LABEL="Ubuntu" # replace with label of root drive you installed ubuntu on
# format
sudo wipefs -a $USB_DEV
sudo dd if=/dev/zero of=${USB_DEV} bs=1M count=128 conv=notrunc
(
echo n # new partition
echo p # primary
echo 1 # partition number 1

gregjhogan

DISK_DEV=/dev/sda
sudo find /dev -type l | xargs -I {} bash -c 'echo -n "{} = "; readlink -f {} +' | grep $DISK_DEV

gregjhogan

DISK_DEV=/dev/sd<?>
DISK_PWD="" # leave empty or set to something you will remember
sudo hdparm --user-master u --security-set-pass "$DISK_PWD" $DISK_DEV
sudo hdparm --user-master u --security-erase-enhanced "$DISK_PWD" $DISK_DEV
# secure erase should clear user password and disable security when complete
#sudo hdparm --user-master u --security-disable "$DISK_PWD" $DISK_DEV

gregjhogan

# on server (waits for connection)
ffmpeg -framerate 20 -i /path/to/video.hevc -an -c:v copy -f hevc tcp://<server-ip>:8888?listen
# on client (format -f can often be auto-detected)
ffplay -f hevc -i tcp://<server-ip>:8888 -framerate 20
# note that -framerate xx is needed because you can't know the frame rate of a raw hevc file

gregjhogan

# multi-threaded off
7z b -mmt=off
# 4 threads
7z b -mmt=4

gregjhogan

# get config for which branches will get pulled
git config --get remote.origin.fetch
# e.g. only master: +refs/heads/master:refs/remotes/origin/master

# set config to pull all branches
git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"