How to add startup script to OSX?

Question

Hi,
Now , There is an applicaition(run as root).
I want to add it to startup items via script.
On Linux, The script can be added to /etc/rc.d/rc.local.
Another,The application run as root,
Every time use sudo app, and user has to input password,
how to run it without any input?
If it is impossible, I need to remove user role check from application?

Answer 1

Yes, I am sure of that they are owned by root,
and have same mode(File/Dir) as the example.
This is not useful yet???
I give the 3 files content as follow:
1: upsilon
#!/bin/sh
. /etc/rc.common
StartService ()
ConsoleMessage "Starting Megatec System tech. UPS monitor"
/etc/upsilon/upsilon start
StopService ()
ConsoleMessage "Stopping Megatec System tech. UPS monitor"
/etc/upsilon/upsilon stop
RestartService () { StopService; StartService; }
RunService "$1"
2:StartupParameters.plist
Description = "Megatec System tech. UPS monitor";
Provides = ("upsilon");
Requires = ("Network");
OrderPreference = "Late";
Messages =
start = "Starting Megatec System tech. UPS monitor";
stop = "Stopping Megatec System tech. UPS monitor";
3:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist SYSTEM "file://localhost/System/Library/DTDs/PropertyList.dtd">
<plist version="0.9">
<dict>
<key>Starting Megatec System tech. UPS monitor</key>
<string>Starting Megatec System tech. UPS monitor</string>
<key>Stopping Megatec System tech. UPS monitor</key>
<string>Stopping Megatec System tech. UPS monitor</string>
</dict>
</plist>
There are any problems on the files?