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It looks like bartus11 has mostly answered your question. It is an sccs (Source Code Control System) ID comment. In this case it says that this script is version 1.11 and was last updated on November 29, 1989. The SMI is for Sun Microsystems, Inc.
Once upon a time, every file that was part of a Solaris system distribution that had a place where a comment could be included contained a line like this. Binary files also contained data like this. You can use the what utility to extract this information from any file that contained the @(#) sccs ID introducer.
