usage: vln [-h] [--certfile CERTFILE] [--token TOKEN] [--version] [-d]
           [--vos-debug] [-v] [-w]
           source target

vln creates a new VOSpace entry (LinkNode, target) that has the same modes as
the source Node. It is useful for maintaining multiple copies of a Node in
many places at once without using up storage for the ''copies''; instead, a
link ''points'' to the original copy.

Only symbolic links are supported.

vln vos:VOSpaceSource vos:VOSpaceTarget

examples:

    vln vos:vospace/junk.txt vos:vospace/linkToJunk.txt
    vln vos:vospace/directory vos:vospace/linkToDirectory
    vln http://external.data.source vos:vospace/linkToExternalDataSource

positional arguments:
  source               location that link will point to.
  target               location of the LinkNode

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

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