Automating "enter" keypresses for bash script generating ssh keys

Agree with Michel Marro except that it needs some more: If the file already exists, it will still be interactive asking if it has to overwrite it.

Use the answer of this question.

yes y | ssh-keygen -q -t rsa -N '' >/dev/null

The redirection to null is necessary to silence the overwrite message.

echo -e "\n"|ssh-keygen -t rsa -N ""

It is recommended to use ed25519 for security and performance.

yes "y" | ssh-keygen -o -a 100 -t ed25519 -C "Bla Bla" -f /mypath/bla -N ""

here

-o OpenSSH key format instead of older PEM (needs OpenSSH 6.5+)

-a Number of primality test while screening DH-GEX candidates

-t Type of key (ed25519, RSA, DSA etc.)

-f /mypath/bla The output file path and name

-N "" Use empty passphase

and yes "y" for no interaction.

It will generate two files

/mypath/bla
/mypath/bla.pub

where the bla file is private and bla.pub is public.