UNIX
UNIX Operating System was developed at Bell Labs by Ken Thompson, Dennis Ritchie and others in 1970. Its a multiuser , multi tasking operating system. Due to rising demands of UNIX OS in the 70’s and 80’s for among commercial organisations and academic research , different flavours of UNIX OS has been developed such as University of California, Berkeley (BSD), Microsoft (Xenix), IBM(AIX), and Sun Micro Systems (Solaris). Next decades saw the development of many cloned version of UNIX such as RedHat LINUX, SUSE LINUX etc
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