seafile_ynh/conf/first_launch.exp

#!/usr/bin/expect
set timeout 10

set admin_email [lindex $argv 0]
set admin_password [lindex $argv 1]

spawn /var/www/seafile/seafile-server-latest/seahub.sh start-fastcgi

expect "for the admin account?"
send "$admin_email\r";

expect "for the admin account?"
send "$admin_password\r";

expect "Enter the"
send "$admin_password\r";

interact