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Where can I find source code for Linux core commands?

All these basic commands are part of the coreutils package.
You can find all information you need here:
http://www.gnu.org/software/coreutils/
If you want to download the latest source, you should use git:
git clone git://git.sv.gnu.org/coreutils
To install git on your Ubuntu machine, you should use apt-get (as far as I know, it's not included in a standard installation):
sudo apt-get install git
Truth to be told, here you can find specific source for the ls command:
http://git.savannah.gnu.org/cgit/coreutils.git/tree/src/ls.c
Only 4890 code lines for a command 'easy enough' as ls... are you still interested in reading it?? Good luck! :D
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