prune version (return code: 0)
Can't open version
prune -h (return code: 0)
Usage: prune [options] [<files>]
Options:
-h : Print this message
-? : Print this message
-v : Verbose
-n<node> : Name node to prune.
-N<attrspec> : Attribute specification to apply to pruned nodes
Both options `-n' and `-N' can be used multiple times on the command line.