1. Modify the configuration file
The full English name of sudo is super user do, that is, to execute commands as a super user (root user). Whether the user has the execution authority of the sudo command depends on whether it is set in the /etc/sudoers file.
/etc/sudoers is a text file with specific syntax, don't use vim or vi to edit directly, but use visudo command. It should be noted that only the root user has the permission to execute this command.
Switch to the root user, enter visudo in the command line, and you can directly enter the edit page of /etc/sudoers.
2. Add configuration at the end
ffcs ALL=(ALL) NOPASSWD:ALL
In this way, the ffcs account can use sudo without entering a password.
3. Save and exit.