You can use Audacity, with LADSPA effect. It has the Generate menu, which can help you generate sine, triangle or square wave. Even DTMF Tones! And it's a GTK application, so don't bother read command line. You can generate the waveform, and then save it to a file, and play back anytime you like. Remember you have to EXPORT the project into a well known format, rather than SAVE the project with .aup format: other programs won't read it.
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