Or, strange as it may seem, they learn how to write software from a four-year college degree. And colleges are notoriously bad at teaching so much as source control, let alone what source control options are there, how to use a bug tracker, etc. (Which makes sense, because you don't strictly need source control if you aren't collaborating heavily, and you don't need a bug tracker if you have a single development week-by-week.)
Seriously... My favorite was in a lower level DB class we had to write, basically, a small PHP app connected to MySQL. On the first day of class the instructor stressed this class was about databases, not PHP, and would basically just cover getting a connection going and the rest was up to us. I think having been doing development and getting paid for it via 'internships' at various companies when I was younger really made me a better, but angrier student in my college CS days. On the one hand, I needed zero time to get up to speed on C, C++, Java, and PHP syntax so I could focus on the algorithms and other topics being taught. But I doing so it became very clear that I was going to the real world and most of this stuff wasn't coming with me.
