How to simulate two consecutive ENTER key presses for a command in a bash script?

Question

[EDITED] It can be considered as an extension to [this question][1]. echo | command The above command can be used to supply one 'ENTER' character to the command's first input request.

How can i supply the next 'ENTER' character to the same command in its second input request.

Please comment if any other details are required.

Am giving the specific example which i want to implement. I need to run SSH-keyGen commmand in my shell script. It will ask for following inputs:

1. Enter the target file name
2. Enter the pass phrase
3. Enter the pass phrase again

How can we pass these three inputs to the command?

I tried with,

echo -ne "\n \n"| ssh-keygen  //which is passing two new lines for the first input request only.

and echo -ne "\n"|(echo -ne "\n"|ssh-keygen)// but still no positive result

Note: Am avoiding the input file name request in the above two command, just to make the things simple

Answer 1

You should take a look at expect:

#!/usr/bin/expect
#set timeout 10
set clientName [lindex $argv 0];
set hostName [lindex $argv 1];
set passWord [lindex $argv 2];

spawn ssh "$hostName";
expect "Password:";
send "$passWord\r";
expect "$hostName";