Hi there, you've come across CoralCMD, a multi-user system (sometimes referred to as pubnix or tilde-system) with a tropical theme.

CoralCMD runs OmniOS, an Illumos distribution. If you don't know what Illumos is, it's a fork of OpenSolaris prior to the Oracle takeover of Sun Microsystems, resulting in the source code being shut down. Since CoralCMD runs on Illumos, most commands and documentation for Solaris apply to CoralCMD.

CoralCMD hosts email, web space, a PBX extension, shell accounts, and more for users to enjoy. Users also get ~30GiB of space in their home directory to use.

There is also a documentation archive for the OS and other components.