force fping to write the output directly to the file

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Alej Calero

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Jul 5, 2019, 5:09:24 PM7/5/19

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if I launched the following command:
fping -a -f urls-list > urls-clean-list
Fping writes the output to the screen (RAM) and then to the end to the output file (instead of writing directly to the output file). If the list to be consulted is very large (millions of urls), it causes the collapse and if there is a power cut, the work is lost.

Is there any parameter to avoid this, and force fping to write the output directly to the file?