You might not have the ability to install Expect on the target server. This is often the case when one writes, say, a Jenkins job.
If so, I would consider something like the answer to the following on askubuntu.com:
https://askubuntu.com/questions/338857/automatically-enter-input-in-command-line
printf 'y\nyes\nno\nmaybe\n' | ./script_that_needs_user_input
Note that in some rare cases the command does not require the user to press enter after the character. in that case leave the newlines out:
printf 'yyy' | ./script_that_needs_user_input
For sake of completeness you can also use a here document:
./script_that_needs_user_input << EOF
y
y
y
EOF
Or if your shell supports it a here string:
./script <<< "y
y
y
"
Or you can create a file with one input per line:
./script < inputfile
Again, all credit for this answer goes to the author of the answer on askubuntu.com, lesmana.