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GNU Smalltalk User's Guide

4.10.1 The Output Stream

The examples in this book all work because they write their output to the Transcript stream. Each class implements the printOn: method, and writes its output to the supplied stream. The printNl method all objects use is simply to send the current object a printOn: message whose argument is Transcript (by default attached to the standard output stream found in the stdout global). You can invoke the standard output stream directly:

'Hello, world' printOn: stdout ! stdout inspect !

or you can do the same for the Transcript, which is yet another stream:

'Hello, world' printOn: stdout ! Transcript inspect !

the last inspect statement will show you how the Transcript is linked to stdout(35).