wipeFree
This command is in beta form. Available in command line form only (no GUI).
The wipeFree command wipes free (unused) space on any volume, leaving existing files and folders untouched.
Command line usage
There are no options, only one argument, the volume name whose free space should be wiped. (If the volume name includes a space, be sure to quote the name, as shown).
Lines that start with '#' are comments.
# wipe free space on volume Macintosh HD
dgl wipeFree "Macintosh HD"
# wipe free space on volume Photos
dgl wipeFree Photos
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