Unix-like
A
Unix-like operating system is one that behaves in a manner similar to the
UNIX system. The first
Unix-like operating systems were developed because of AT&T's licencing of Unix that prevented the sale of Unix to commercial organisations. The Unix-like operating systems that were available in the early 1980's included Idris, Coherent
http://www.nivel0.net/Coherent and UniFlex
http://www.rtmx.com/UniFL/A> When AT&T allowed Unix to be sold to commercial organisations the market for the Unix-likeThe Open GroupPOSIXopen sourceLinuxFreeBSDOpenBSDNetBSDHURD
