rbd: be helpful with invalid command

$ rbd asdf
rbd: error parsing command 'asdf'; -h or --help for usage

Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/src/rbd.cc b/src/rbd.cc
index c0db7a6414ead6894cc279b58b1d486bfa3f6087..147eb2c5138e981b4185488d4592a52a9d23abe8 100644 (file)
--- a/src/rbd.cc
+++ b/src/rbd.cc
@@ -2256,7 +2256,7 @@ int main(int argc, const char **argv)
     opt_cmd = get_cmd(*i, false, false);
   }
   if (opt_cmd == OPT_NO_CMD) {
-    cerr << "rbd: error parsing command '" << *i << "'" << std::endl;
+    cerr << "rbd: error parsing command '" << *i << "'; -h or --help for usage" << std::endl;
     return EXIT_FAILURE;
   }