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You can print to a file from the terminal using the print command. For example,

x=0:0.1:10
figure()
plot(sin(x))
print('~/sine.jpg')

You can print to a file from the terminal using the print command and then open the jpg file in SMC using the open command via Octave's system command. For example,Here is my .m file:

x=0:0.1:10
figure()
plot(sin(x))
print('~/sine.jpg')
x=0:0.1:10;
figure();
plot(sin(x));
print('~/sine.jpg');
system('open sine.jpg');

You can print to a file from Octave in the terminal using the print command and then open the jpg file in SMC using the open command via Octave's system command. Here is my .m file:

x=0:0.1:10;
figure();
plot(sin(x));
print('~/sine.jpg');
system('open sine.jpg');

This will pop open the graph in a new tab within SMC.

%octave
x = 0:0.1:10;
h = figure('visible', 'off');
plot(sin(x));
saveas(h,"~/fig.png");
%sage salvus.file("fig.png")