Shell Programming: Loops
Loops are the key step that turns a Shell script from "a single command" into an "automated workflow." Batch processing files, repeatedly checking status, executing tasks from a list -- these all rely on loop structures underneath.
This material works best when you experiment with your own directories while reading. For example, iterating over a set of filenames, batch-printing information, or applying the same filter to multiple logs -- all more memorable than just reading the syntax.