Posted Aug 13, 2007 9:56 UTC (Mon) by farnz (guest, #17727)
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If my memory serves me well, SunOS 4.x and below are BSD, while SunOS 5.0 onwards are SysV. To emphasise the change, Sun's always released SysV-based SunOS under the Solaris label, not as a separate SunOS product, although Solaris is just branding for the newer SunOS products.