usage: vtag [-h] [--certfile CERTFILE] [--token TOKEN] [--version] [-d]
            [--vos-debug] [-v] [-w] [--remove]
            node property [property ...]

provides set/read/(list) functions for property(ies) of a
node.

Properties are attributes on the node.  There can be users attributes or
system attributes.

Only user attributes can be set.

examples:

set at property:  vtag vos:RootNode/MyImage.fits quality=good
read a property:  vtag vos:RootNode/MyImage.fits quality
delete a property: vtag vos:RootNode/MyImage.fits quality=
                   or
                   vtag vos:RootNode/MyImage.fits quality --remove
list all property values:  vtag vos:RootNode/MyImage.fits

positional arguments:
  node                 Node to set property (tag/attribute) on
  property             Property whose value will be read, set or deleted

optional arguments:
  -h, --help           show this help message and exit
  --certfile CERTFILE  filename of your CADC X509 authentication certificate
  --token TOKEN        authentication token string (alternative to certfile)
  --version            show program's version number and exit
  -d, --debug          print on command debug messages.
  --vos-debug          Print on vos debug messages.
  -v, --verbose        print verbose messages
  -w, --warning        print warning messages only
  --remove             remove the listed property

Default service settings in ~/.config/vos/vos-config.
