note

teaching: 40 minutes

exercises: 10 minutes

questions:

• How can I perform the same actions on many different files?

objectives:

• Write a loop that applies one or more commands separately to each file in a set of files.
• Trace the values taken on by a loop variable during execution of the loop.
• Explain the difference between a variable’s name and its value.
• Explain why spaces and some punctuation characters shouldn’t be used in file names.
• Demonstrate how to see what commands have recently been executed.
• Re-run recently executed commands without retyping them.