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_{Related, but not identical tips for MATLAB.}

A little known and little used feature of Octave is that most builtin functions can be called without parentheses, in which case they will treat whatever follows it as a string (as long as it doesn't contain spaces). If it contains spaces you need quotation marks. This can frequently be used to save a byte or two when using disp. All the following work, and gives the same result:

disp('Hello')
disp Hello
disp"Hello"

If you have spaces, then you must have the quotation marks:

disp('Hello, World!')
disp"Hello, World!"

Other, less useful examples include:

nnz PPCG
ans = 4
size PPCG
ans = 1 4
str2num 12
ans = 12