There's no manual page for the hardlink utility, and the usage message doesn't tell what the various options stand for. Here's a patch that improves the verbosity of the usage message according my understanding of the options.
Created attachment 115991 [details] Increase verbosity of hardlink's usage message
Cc'ing hardlink's apparent author...
Thanks, this is surely ok.
it's on my todo, but I'm going to be busy with kernelsummit/OLS this week, so next week at the soonest.
will be in tomorrows rawhide.