Getting the source for something that doesn't seem to have an associated package?

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http://unix.stackexchange.com – I recently just wanted to look at the source code for sha1sum. alec@ROOROO:~/tmp-source-study$ apt-get source sha1sum Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to find a source package for sha1sum The next thing I did was to read the manual. The manual mentioned coreutils. But I don't see anything like sha1sum.c, and there's no associated Debian package for sha1sum, as far as I can tell. What should I be doing to get the source code for this small, basic program without having to use a search engine, from the convenience of my (HowTos)