/!\: This thread is not kept up-to-date anymore, please go to the following one to get the latest links and instructions, or for any kind of feedback on the scripts:
Install Crypt of the NecroDancer on Linux

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Hello fellow Debian users, Ubuntu lovers and Mint freaks!

Here you’ll find scripts allowing you to build a .deb package from your MojoSetup installer (.sh) for Crypt of the NecroDancer. You can install it through DPKG and remove it through any APT front-end (apt-get, aptitude, synaptic, etc.).

Download links and usage instructions can be found on the following page:
Crypt of the NecroDancer

I hope you’ll enjoy the comfort provided by these scripts as much as I enjoy writing and tweaking them ;)

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Here you go for more supported games!

Your instructions don't make any sense. Why do you start some of your lines with a # or a $? Terminal tells me it straight doesn't know what to do with those. And when I try inputting the line without that starting symbol, it doesn't work.

sh: 0: Can't open ./play-crypt-of-the-necrodancer_gog.2.1.0.3.sh

sh: 0: Can't open play-crypt-of-the-necrodancer_gog.2.1.0.3.sh

"$ command" means "command" has to be run with your regular user, and "# command" has to be run with root rights. You don’t type the symbol, it is just a visual indication of the level of rights needed by the command.

Both symbols, # and $, represent the shell prompt. As mentioned, by convention $ is regular user rights and # is elevated/root rights. You didn't follow the directions correctly. You need to download the scripts and installer to the same directory (e.g. $HOME/cotND) and [i]cd to said directory (Step #2).