Source code for Unix commands

hi Folks!!
Just got a question in mind....
Is it possible for us to read the c code of the commands in the bin directory? I work on a LINUX server and i only see executables in the bin directory which i obviously can't read. Please help me regarding this.
Thanks in advance and wishing you a very happy and prosperous New year 2010.

  1. In debian kind of systems, following is the way i will get source.
apt-get source PACKAGE-NAME

For getting the zip command source.

apt-get source zip

If you get this error,

E: You must put some 'source' URIs in your sources.list

Add a source repository, like.,

deb-src http://debian.uchicago.edu/debian/ etch main contrib non-free
  1. If you cannot do it, navigate through the packages.debian.org and download it from there.
    For 'bc' command source, here you can get: Debian -- Details of source package bc in lenny

I guess this is what you want:

Index of /gnu/coreutils