We use ssh-keygen to generate ssh keys. Sometime we need to generate keys without any interaction during runtime. We have the following ways to do this.
###1. Use the full commands
Provide all parameters needed when running ssh-keygen, as
ssh-keygen -t rsa -N "" -f my.key
-N ""tells it to use an empty passphrase (the same as two of the enters in an interactive script)
-f my.keytells it to store the key into my.key (change as you see fit).
###2. Provide “ENTER”s before running ssh-keygen
echo -e "\n\n\n" | ssh-keygen -t rsa
By using pipe, we actually enters 3 “ENTER”s while executing ssh-keygen, which uses the default values.