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Re:FreeRDP 2.0 – A Remote Desktop Protocol implementation by gdrift on Saturday April 11, 2020 @02:25AM (#22839989)
>it wants a file

Have you tried process substitution?

  <(curl -s ipinfo.io/ip)
https://en.wikipedia.org/wiki/Process_substitution
Re:FreeRDP 2.0 – A Remote Desktop Protocol implementation by squarefoot on Saturday April 11, 2020 @12:27PM (#22842472)
Worked perfectly, thanks!