Installing Xcode via command line I am a Linux user and have never used OSX before. Someone asked me for help with installing some software on an OSX "Lion" server. I asked him to give me an SSH shell, assuming that would be sufficient. However things are more tricky than I thought.

I wanted to install homebrew, but it didn't install because there was no cc on the system. After some google, I suppose I need to install Xcode. I just downloaded xcode 4.5 from the apple developer site, and mounted it on the system. It contains a dir Xcode.app with a bunch of stuff in it. How do I go from here?

Can I install Xcode without physical access to the machine? All I really want is get homebrew running at this point.
You might be better off just installing the standalone Developer Command Line Tools (which includes gcc and other standard developer toolchain items). You can get it from Apple's Developer Downloads (which requires a free developer account). Unfortunately there's no direct link, but just search for command line tools and you'll find it (note that there are different downloads for Lion and Mountain Lion).

The download is a DMG. Mount that, and you'll find a .mpkg file, which you can install via the command line: sudo installer -pkg "Command Line Tools.mpkg" -target /.