This is an implementation standard defined by the 4.2 release of the "Berkeley Software Distribution",
カリフォルニア大バークレー校 (the University of California at Berkeley)によりリリースされた"Berkeley Software Distribution" - JM
Copyright (c) 2001 Robert Kiesling. Copyright (c) 2002, 2003 David Merrill. The contents of this document are licensed under the GNU Free Documentation License. Copyright (C) 1999 JM Project All rights reserved.