/sci/ - Science & Math

/sci/, help me decide, these are the classes which I have a choice in taking for my computer science majors extra science or math elective
Other than this I am taking: Art 400 Model Drawing (I am an art double major), CompSci 352 Software Engineering, Math 295 Discrete Mathematics I
I don't want such a hard course load that I can't handle it. I suck at maths and science, really.

Here are my options:
>Physics I
>Organismal Biology
>Chemistry I

Hello /sci/, this is probably a really simple question for you all, but I was hoping someone could help.

Say I have a c program on a UNIX server. I have a character array like
char buffer[4096];
Now what I want to do is take a command like ls on the unix server and write it into this char array.