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The exercise:
Modify the programs entab and detab (written as exercises in Chapter
1) to accept a list of tab stops as arguments. Use the default tab
settings if there are no arguments.
I’m not sure what a list of tab stops would be?
My guess: ./entab -t 5,5,8,5
first tab stop is 5 spaces, second is 5, third is 8, forth is 5?
When I did that exercise, I used “column” numbers.
That mimics the behavior of tab stops on a typewriter, a primitive machine which was much more popular when I did that exercise (and when K&R wrote the book) than it is today.
I miss typewriters.