eject - 2.1.5+deb1+cvs20081104-13.2 main

This little program will eject CD-ROMs (assuming your drive supports
the CDROMEJECT ioctl). It also allows setting the autoeject feature.
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On supported ATAPI/IDE multi-disc CD-ROM changers, it allows changing
the active disc.
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You can also use eject to properly disconnect external mass-storage
devices like digital cameras or portable music players.