So if, for instance, I wanted to open an .as file in Notepad ++ with the cursor lined up at the 15th character of the 10th line, the command might look like this:
C:\Program Files (x86)\Notepad++\notepad++.exe filename.as -n10 -c15
What's the equivalent for the Flash IDE?
(I know this is kind of only tangentially a programming question, but this seemed like the most applicable place for it.)
Adobe has improved the Flash IDE with Flash CC but it's still not a text editor or a fully featured code editor. So no it can't do that. Many people using Flash IDE, code on the side with a free code editor like FLashDevelop to avoid using the Flash IDE for that purpose.