How to remove obsolete VTL configuration export files

In DDOS 5.5, a tool to export the full Virtual Tape Library (VTL) configuration and import back on the same DDR introduced. Use for failure, on a new DDR, or migration.
The tool is command line only, provided by the following command:

# vtl config export [vtl <vtl>] output-file <filename>

# vtl config import [vtl <vtl>] [check-only]  [skip-initiators] [retain-serial-numbers] [on-error {continue | stop}] input-file <filename>

The command options are described in the "Data Domain Operating System Command Reference Guide" for the specific DDOS release. As reported in the Guide, when exporting a VTL configuration the output is automatically saved in /ddr/var/etc/vtl_configuration_files directory. There is not a command to delete old configuration files. Do not delete via network shares due to default permission. If multiple old files must be deleted, open a Service Request.

The tool prompts to overwrite the existing saved configuration when an existing file name is provided for the "output-file" option. Copy it off DD, and rename it in a convenient way to track the configuration changes. This procedure allows VTL configuration change tracking while keeping only one file on DD, with the current configuration.