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.
The publisher is the owner of the copyright to a song not the sound recording. That just means the words and music: melody, harmony, lyrics. If you or a songwriter/composer you know has never signed away their publishing rights to a publishing deal, then the songwriter IS the publisher. However, don't get confused with a sheet music publisher or CD manufacturer.