Where is the source code for Linux built in Services? [closed]

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I am looking at linux startup services, like Cron which runs at level 5 located in init.d, in the startup script I can only see the script file and location of binary file which is executed on startup.

Where can I see the actual source code of these services?

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On Debian (or Debian based) systems, you can also apt-get source <packagename>, assuming you have the appropriate deb-src URLs in /etc/apt/sources.list.

This works for underprivileged users, it will fetch the source and uncompress it in the current working directory.

To reproduce the builds, its a good idea to have debhelper installed, or let apt satisfy the dependencies automagically by using apt-get build-dep <packagename>

Its a lot more convenient than googling / searching for the source archive that will reproduce the version of the program you want to study or modify.

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It depends on your distribution, but Debian has source packages for each package, e.g. http://packages.debian.org/source/lenny/cron