History
An ls utility appeared in the original version of AT&T UNIX. Today, two popular versions of ls are the Free Software Foundation's (part of the GNU coreutils package) and the one released by various BSD variants, such as FreeBSD, OpenBSD, NetBSD, and Apple Computer's Darwin. Both are free software and open source.
Read more about this topic: Ls
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—Ralph Waldo Emerson (1803–1882)