Courtesy: Joyent wiki
SmartMachines are based on OpenSolaris, so Linux or BSD commands may not be where you expect them to be. If you’re coming to a SmartMachine from Linux, you may find that some things are a little different than what you are familiar with. The SmartOS has most of the GNU tools that you are accustomed to, just that they are not default tools. The SmartOS used on Smart Machines is a major fork of OpenSolaris, much as Ubuntu is a major fork of Debian Linux, so the default is to use its own tools. Your fingers’ muscle memory may find the differences a little unsettling at first, but rest assured that everything you’re used to is still here. It’s just in a different place, or it may have a different name.