Require at least one element of command

man/mosh-server.1

@@ -21,7 +21,7 @@ mosh-server \- server-side helper for mosh
 .B mosh-server
 [IP address to bind]
 [port number to bind]
-[-- command command2 ...]
+[-- command...]
 .br
 .SH DESCRIPTION
 \fBmosh-server\fP is a helper program for the 

src/frontend/mosh-server.cc

@@ -74,7 +74,7 @@ int main( int argc, char *argv[] )
   char **command = NULL;
 
   /* Look for command */
-  for ( int i = 0; i < argc; i++ ) {
+  for ( int i = 0; i < argc - 1; i++ ) {
     if ( 0 == strcmp( argv[ i ], "--" ) ) { /* start of command */
       command = argv + i + 1;
       argc = i; /* rest of options before -- */