@james is probably correct. Usually by the time you’re using loops, the command line becomes a hindrance. Creating a command file for input would make sense, but the tutorial aims to focus on the subject in question only - introducing more advanced features at that stage may be confusing.
That said, perhaps struggling with command line escape characters can be considered a valuable tutorial for anyone wishing to use it 
Edit: I thought I’d better mention that although the tutorials can be considered “official”, they were very kindly created by a community member (Garry Osgood) and I assume tested under linux. Free time and patience to write documentation is a rare thing 