How to save/print MATLAB figure in a file?

Imagine I want to print/save a matlab figure into disk. May be I want to save it in PNG format. How do I do that?
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file_handler=figure;
plot(randn(10,1));
print(file_handler,'-dpng', 'my_file_name.png');
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Check your current folder. A file named my_file_name.png should be there!