UNIX command for terminal

Here is what I want to do:

I want to send the terminal command to 25 laptops all at once to direct them to our internal server for software update.

I know how to log in to all of the machines at once.

osascript -e 'tell application "System Events"' -e 'keystroke "username"' -e 'keystroke tab' \

-e 'delay 0.5' -e 'keystroke "password"' -e 'delay 0.5' -e 'keystroke return' -e 'end tell'

I know how to open terminal.

open -a terminal

Now what I want to know is how to have it type this in for me:

sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate CatalogURLhttp://SERVER.local:8088/index-mountainlion-lion-snowleopard-leopard.merged-1.su catalog

Then have a pause and then type my password.

Bonus points for then a script to force it to check for and do the update.