Many of the examples in this manual print text when they are evaluated. In this manual the printed text resulting from an example is indicated by ‘-|’. The value that is returned by evaluating the expression is displayed with ‘⇒’ (1 in the next example) and follows on a separate line.
printf ("foo %s\n", "bar")
-| foo bar
⇒ 1
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/Printing-Notation.html