Summation of grep -c

The unix shell grep command have an option called "-c" which will give you the count of matching lines per file. Sometimes it's desirable to have a summation of all these count, for which i could not find an option. I wrote a one line command that perhaps

ssh to remote machine for the first time throws error

TIP : Today i tried to ssh to my vps using the following, from my Ubuntu machine. avr@avr-Latitude-E5500:~$ ssh and the following error showed up. y@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!Someone could be eavesdropping