How do I empty my tape silo's inport (CAP) from the command line?

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The vmupdate command is used to achive this. The most basic form of the command to empty the inport is:

vmupdate -rn < robot_num > -rt < robot_type > -interactive -empty_ie

Where robot_type and robot_num are the NetBackup type and number.

There are other options for vmupdate which allow changing the default behaviour (pool, ID's, etc...) of the loaded tapes.