ls stands for list; so it displays the list of the files that starts with 'chapter' with suffix '1' to '5', chapter1, chapter2, and so on.

To add something to above answer,

ls -x chapter[1-5]

it will show all the files with chapter1, chapter2 and so on but only with execute permission.

same answer but -x option will display the chapter1 to chapter5 files in columns.

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