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I have forgotten the command to run in terminal to point a computer to a
different software update server.

thanks richard

What it currently is:

defaults read /Library/Preferences/com.apple.SoftwareUpdate.plist

Set it to something new:

sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate CatalogURL http://updates.updateserver.com:8088/index.sucatalog

Set it back to Apple:

sudo defaults delete /Library/Preferences/com.apple.SoftwareUpdate CatalogURL

Apple KB Article: http://support.apple.com/kb/HT4069

http://lmgtfy.com/?q=set+softwareupdate+server+terminal+mac+osx

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