User

• Add a new user

  • adduser $username
  • low level: useradd -m $username

• Change $HOME permission

  • default is 755 on Debian 10
  • only executable: chmod 750 $HOME
  • nothing: chmod 700 $HOME

• Grant sudo

  • usermod -aG sudo $username
  • /sbin/usermod -aG sudo $username

• Delete a user

  • deluser $username
  • low level: userdel [-r] $username

• Change user id

  • usermod -u 1001 $username

• Change group id

  • groupmod -g 1001 $username

• Changer ownership

  • chown -R $username:$groupname $folder