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• Install the necessary packages:

sudo apt-get install apt-transport-https ca-certificates
curl -s https://syncthing.net/release-key.txt | sudo apt-key add -
echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
sudo apt-get update
sudo apt-get install syncthing
sudo apt-get install git

• Start syncthing once:

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!pip install streamlit
!npm install localtunnel
!streamlit run http://app.py &>/dev/null&
!npx localtunnel --port 8501

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• In /etc/ssh/sshd_conf, set UsePrivilegeSeparation to no
• In /etc/ssh/sshd_conf, temporarily enable plaintext passwords
• In /etc/ssh/sshd_conf, change port (e.g. to 23) to avoid confusion with Windows SSH server
• sudo service ssh restart
• Add alternative port as a new rule to Windows firewall
• On the client: ssh-copy-id user@server
• In /etc/ssh/sshd_conf, re-disable plaintext passwords

To fix Could not load host key ... error:

• sudo ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key

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• Adapt display scaling (1.3), icon sizes (48), font sizes (9), fixed font DPI (125) in system settings
• Adapt icon sizes (48) in Dolphin settings
• Adapt layout.css.devPixelsPerPx in Firefox about:config (1.3)
• https://unix.stackexchange.com/questions/568793/increase-system-tray-icon-size-in-kde (2)
• https://steamcommunity.com/discussions/forum/1/1698294337768975733/

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• Install AWS CLI following https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-linux.html#cliv2-linux-install
• Configure with provided CSV file: aws configure import –csv file://credentials.csv
• Sync bucket: aws s3 sync s3://bucket-name local-folder

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• On a Mac, we might need to run first: git config --global core.trustctime false
• Rebase: git rebase -i --root
• Edit according to instructions
• Set commit date as author date: git filter-branch -f --env-filter 'GIT_COMMITTER_DATE=$GIT_AUTHOR_DATE; export GIT_COMMITTER_DATE'
• Force push: git push origin +master
• In case of errors: git rebase --abort

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• On the client: ssh-copy-id user@server
• On the server, in etc/ssh/sshd_config: PasswordAuthentication no
• sudo apt-get install ufw
• sudo ufw allow ssh
• sudo ufw enable
• sudo apt install fail2ban

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• Add user with home directory: sudo useradd -m username
• As user, change default shell: chsh -s /bin/bash
• Set temp. password: sudo passwd username
• Create group: sudo groupadd groupname
• Add users: usermod -a -G groupname username
• Make shared directory: sudo mkdir /home/groupname
• Set group for shared directory: sudo chgrp groupname /home/groupname
• Add write access for group: sudo chmod g+w /home/groupname
• "Set GID" for group (all files created owned by group): sudo chmod 2775 /home/groupname
• Change to different user to test: su - username

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• On the server:

sudo apt-get install git-core
cd ~
mkdir repo.git
cd repo.git
git init --bare
nano hooks/post-receive
  git --git-dir /home/user/repo/.git --work-tree /home/user/repo pull origin master
chmod +x hooks/post-receive

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• df -h: Show disk space for humans
• scp file user@server:path/file: Transfer file over SSH
• whereis command: Path to command
• ssh user@server: Start SSH session (exit with exit)
• lshw -short: Hardware information for humans
• ls -lah dir: Show content of directory for humans, including hidden files
• cd dir: Change directory
• mkdir: Create directory
• rm -rf dir: Delete full directory
• rm file: Delete file