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i want to know how sift extract keypoints from image? or how these lines work?

% Call keypoints executable if isunix command = '!./sift '; else command = '!siftWin32 ';%this on end command = [command ' <tmp.pgm &gt;tmp.key'];="" eval(command);%fill="" data="" of="" tmp.pgm="" in="" tmp.key<="" p="">

i want to know how sift extract keypoints from image? or how these lines work?

% Call keypoints executable
if isunix
    command = '!./sift ';
else
    command = '!siftWin32 ';%this on
end
command = [command ' <tmp.pgm &gt;tmp.key'];="" eval(command);%fill="" data="" of="" tmp.pgm="" in="" tmp.key<="" p="">
>tmp.key'];
eval(command);%fill data of tmp.pgm in tmp.key