Ping for 4 times
Solution 1:
As Olive Twist already answered, ping -c 4 google.com will do it.
If you want to make this as a default, one way is to create an alias for ping with:
alias ping='ping -c 4'
Save it to your ~/.bashrc file to make it permanent or it will last only for the current terminal session.
Solution 2:
Yes, you can. You need to use -c option to tell the ping to do this, like
ping -c 4 google.com
The -c option tells ping program to stop after sending (or receiving ) specified number of ECHO_RESPONSE packets.
See the ping manual page for details.