cat piped_script.sh | expect send-to-console.expect

send-to-console.expect

#!/usr/bin/expect -f
set timeout -1

spawn virsh -c qemu:///system console vm1

expect "Connected"
send "\r"

expect "debian-live login: "
send "root\r"

expect "Password: "
send "toor\r"

expect "Last login: "
expect "# "

while {[gets stdin line] != -1} {
    send "$line\r"
    expect "root@debian-live:"
}
send \004


expect "STRING_ECHOED_FROM_PIPED_SCRIPT_WHEN_DONE"
send "exit\r"

expect "logout"

send "\x1b\r"