Important Features
Running your program a.out using an input file and an output file: %a.out < input.file > output.file
chmod: u - user, g- group, o - other r - read, w - write, x - execute
%more / less filename - view file
%echo $DISPLAY my_machine:0.0 %export DISPLAY=dynasty.cs.columbia.edu:0.0
Note to the beginning programmer: % emacs p1.c will create a new file p1.c if no such file exists.