Priv.txt -

: The "proper content" is the specific flag hidden on the target machine, which you find by searching directories like /home/user/ or /root/ . 3. System Configuration (MySQL)

To disable the restriction (not recommended for production): secure-file-priv="" priv.txt

If you are creating a file to store sensitive notes or credentials locally, because anyone with physical or remote access to your device can read them. : The "proper content" is the specific flag