"@(#)true.sh 1.6 93/01/11 SMI" /* SVr4.0 1.4 */ is an sccs id. Anecdotally (wasn't there at the time): sccs was more common everywhere before RCS b

"@(#)true.sh 1.6 93/01/11 SMI" /* SVr4.0 1.4 */ is an sccs id. Anecdotally (wasn't there at the time): sccs was more common everywhere before RCS because sccs was part of all unix (e.g including BSD UNIX).. it was encumbered as part of the UCB USL suit and rcs use grew after that, then cvs, then svn, then git