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.
A book published by a US author in the US, with copyright notice and renewal after 1922 and before 1978 would be copyrighted for 95 years. After that it would most likely be 95 years unless the author was independent (not employed as an author), in which case it would last 70 years after the year of the author's death.