ubuntu.md

Ubuntu command

• https://github.com/jlevy/the-art-of-command-line#everyday-use
• https://i.imgur.com/xyGqGui.png

Commands

• man [command] or [command] --help: command --help. Find instruction for command. Ex: cat --help

• cat:

  • read the file, combines with grep
  • concat files: cat github-actions.pub >> ~/.ssh/authorized_keys

• tail: reads the last ten (default) rows in the file. Usage: read newest bugs in the log file.

  • tail -n 5 file_name: read 5 rows
  • tail -f file_name: watch the file

• grep: search the file

  • cat file_name | grep key_word

• kill: shutdown a process

  • kill [PID]
  • kill -9 [PID]: force to kill

• top, htop: like task manager on window

• df -h: display free space

• free -h: display free ram

• sudo chown -R ubuntu: .

APT command: Advanced Packaging Tool is a high-level package management tool

• sudo apt update: return updated information of all packages. We should run this before upgrade any packages to get the newest packages URL
• sudo apt upgrade: real upgrade
• sudo apt get [package_name] -y
• sudo apt remove [package_name] -y: Then run sudo apt autoremove to remove other dependencies of the packages

Install yarn

sudo apt remove cmdtest
sudo apt remove yarn
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt-get update
sudo apt-get install yarn -y
yarn install

Key

• ctrl + a & ctrl + e: go to start and end of line