--First let me thank Greeze/Jooky for creating this great addon, and allowing me to continue its development.
What does Startup do?
Startup executes a user-defined list of slash-commands on startup.
Do you get tired of typing all those slash-commands or executing those macros every time you login? Well, now you don't have to, because Startup does it for you.

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Instructions:
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Extract the contents of Startup_2.x.ZIP to\Interface\Addons\

Using a text editor, edit the\Interface\Addons\Startup\Commands.lua file to include the slash-commands that you wish to have executed.
When you login to WoW, your commands will be executed in the order they are listed.

The Commands.lua file consists of the following sections:
ONE TIME ONLY-- This is for commands that you want to have executed for each character only once, and never again. If you decide you want to execute these commands again for a certain character, then use the"/startup onetime reset" command. The next time Startup runs, it will execute these commands for that character.
ALL CHARACTERS-- This is for commands that you want to have executed for each character at every startup.
DRUID-- This is for commands that you want to have executed for DRUID characters.
HUNTER-- This is for commands that you want to have executed for HUNTER characters.
MAGE-- This is for commands that you want to have executed for MAGE characters.
PALADIN-- This is for commands that you want to have executed for PALADIN characters.
PRIEST-- This is for commands that you want to have executed for PRIEST characters.
ROGUE-- This is for commands that you want to have executed for ROGUE characters.
SHAMAN-- This is for commands that you want to have executed for SHAMAN characters.
WARLOCK-- This is for commands that you want to have executed for WARLOCK characters.
WARRIOR-- This is for commands that you want to have executed for WARRIOR characters.
SPECIFIC CHARACTERS-- This is for commands that you want to have executed only for certain characters. Add your character's name (server name is optional) to this section.
ALL CHARACTERS PART DEUX-- This is for commands that you want to have executed for each character at every startup, AFTER everything else.

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Example:
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Ok, lets say you play two characters most of the time, and you want and onscreen message to distinguish the two.
For fun, we'll add an Onscreen command to run on load that says"Ninja Hamster Style Loaded" when you play a Rogue.
1) Open up\interface\addons\startup\commands.lua with your favorite text editor
2) Scroll down to the"ROGUE" section
3) Any command you enter needs to be contained in double brackets, keeping the same form shown in other sections.
4) Now, under the"ROGUE" section, add the line:
[[/script UIErrorsFrame:AddMessage("Ninja Hamster Style Loaded", 1.0, 0.0, 1.0, 1.0, UIERRORS_HOLD_TIME);]],
5) Save the file, making sure it saves to"Commands.lua" and not"Commands.lua.txt".
6) Launch WoW

Now you have a nicepurple text warning you of the intense Ninja-Hamster-Style-ness you are about to enjoy!
----Note there are default messages already included that will state which class is being played---
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Ingame Slash-Commands:
/startup<command> or /su<command>
/su restart - Re-executes Startup commands.
/su onetime reset - Will re-execute the one-time-only commands the next time you restart.
/ru - Reloads your UI
/reloadui - Reloads your UI