Let's break this command down into parts: 1  ls is a utility. Utilities are also sometimes known as commands all on their own, because they indicate the general idea of what you want. - 2 l is a flag that alters how the utility operates.
Publisher and copyright holder are both different persons, a copy right holder is the author of a piece of art, literary works, drama, novels, story etc etc and a publisher is a person who or a publishing house who takes the copyright from the author or rights of the work and publishes it as a book or film etc etc.
This field is for noting the date the edition associated with the listed ISBN was published. Date published can most usually be found on the copyright page of a book. That page will tell you when the work was copyrighted - and if the book is a first edition, the copyright date will be the same as the date published. If it is a later edition, the date will be different. Some books, not all, will list dates for subsequent publications somewhere on the copyright page.