It's more Unix-like than Ubuntu. I presume this means the directories follow a unix naming convention, shell commands are like the old unix ones, etc. It's great if you're trying to learn Unix, solaris, BSD, etc. If you want to add something to your startup files it would be in in a run control script and you'd need to know all the run levels to find the right one plus you'd need to know shell scripting to add it. One thing you'll notice is lagging support for proprietary hardware(think wifi, bluetooth, SD Card Reader), less packages than Ubuntu, less things work out-of-the-box.