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int dataSWAPSize = readSWAPSize();
String SWAPPartition = "(echo n; echo p; echo 3; echo; echo +";
SWAPPartition += dataSWAPSize;
SWAPPartition += "M; echo t; echo 3; echo 82; echo w) | fdisk /dev/sda";
format.runShellCommand(SWAPPartition);
debugProcess(format);
unmount();

int readSWAPSize() {
  int SWAPSize = 0;
  while (!SWAPSize)
  {
    Serial.print(F("Enter the size of the SWAP in MB: "));
    while (Serial.available() == 0);
    String answer = Serial.readStringUntil('\n');
    SWAPSize = answer.toInt();
    Serial.println(SWAPSize);
    if (!SWAPSize)
      Serial.println(F("Invalid input, retry"));
  }
  return SWAPSize;
}

mkswap /dev/sda3
swapon /dev/sda3
vi /etc/fstab3
// vi command to insert a new line
/dev/sda3 swap swap defaults 0 0