octave output plots to PDF/PS/PNG instead of display

[rprr]

I'm trying to get the fft plots working with the command as shown.

rtl_sdr -s 2400000 -f 104300000 -g 20 - | csdr convert_u8_f | csdr fft_cc 1024 1200000 HAMMING --octave | octave -i > /dev/null

For some strange reason, octave output plots do not show up when connecting remotely to a Raspberry Pi with an rtl-sdr dongle.

[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
octave-gui: ../../src/xcb_io.c:259: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
panic: Aborted -- stopping myself...

Likely this is an octave specific x11 authentication issue as other X11 windows show up correctly. I have never used octave but is it possible to send the output directly to a pdf (or ps or png) by modifying the above command without the octave gui.