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Yes, 2 is the number of elements that commands contains. They happen to be arrays. Specifically the elements are:

the array ["commands", "new", "ls"]

and the array [" - Lists current...

The for loop does what you'd expect - it increments until the condition part becomes false.

What you didn't do in your debugging code was print the actual array length you are using:...

The output you posted suggests that you are going around the loop two times while I imagine that you want to go around the loop three times.

It is important to bear in mind that three are three...