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sudo stands for Super User Do. It allows users to run programs with the security privileges of another user (if configured access permissions allow it), by default the superuser and is therefore prefixed before commands when full access to the operating system is required.

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Why my program won't communicate through ttyAMA0 on Raspbian (Jessie)?

Ensure terminal over serial is disabled in raspi-config Run sudo raspi-config and in "Advanced" choose "Serial" (Enable/Disable shell and kernel messages on the serial connection) and disable … Use this instead: sudo systemctl mask [email protected] Ensure UART pins (15 and 16 wPi) are in state ALT0 Use command-line gpio util to check state of all pins gpio readall It …
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