I wanted to use the command line to Secure Wipe a hard drive in OpenMediaVault, based on Debian Linux. I used the built in shred command, details are available at the link below:
https://manpages.debian.org/stretch/coreutils/shred.1.en.html
For example, I like to use the following combination (based on the device number found under Storage->Disks in the GUI):
shred -vfz /dev/sdX
Verbose, force permissions and a final write of zeros (total 4 passes). This is in contrast to the OMW default, which is a single pass:
https://openmediavault.readthedocs.io/en/6.x/administration/storage/disks.html
shred -v -n 1 /dev/sdX