- - Common operating system for supercomputers, once
- - Computer operating system first developed in the 1960s
- - Operating system that's an alternative to Windows
- - operating system whose name sounds like some "game of thrones" characters
- - Bell Labs development of the 1970s
- - archetypal operating system
- - Universal veto for operating system
- - Trailblazing operating system
- - Operating system developed by AT&T originally
- - Operating system designed by AT&T employees
- - Operating system from Bell Labs
- - Bell Labs operating system
- - Venerable operating system
- - Operating system developed at Bell Labs
- - Early operating system
- - Computer operating system developed by Bell Labs
- - Operating system since the '60s
- - Operating system since the 1970s
- - Operating system option
- - Pioneering computer operating system
- - Operating system on many Internet servers
- - Early computer operating system
- - Certain operating system
- - Operating system developed by Bell Labs
- - Operating system since the '70s
- - Operating system since the early '70s
- - Oft-cloned operating system
- - Operating system type
- - Common operating system
- - Computer operating system
- - System used by servers
- - Operating system in many servers
- - Operating system for many Internet servers
- - Operating system with many clones
- - System developed by Bell Labs
- - Server system
- - Source of the Mac's operating system
- - Operating system used since the 1970s
- - Operating system choice
- - Computer system developed at Bell Labs
- - Widely used computer operating system
- - Computer workstation operating system
- - Operating system since 1969
- - Longtime computer operating system
- - Bell Labs system
- - Bell Labs server system
- - PC operating system
- - Computer operating system developed at Bell Labs
- - System for some servers
- - Computer system
- - Computer system since the '60s
- - Operating system that doesn't do Windows?
- - System developed at Bell Labs
- - Computer system developed at AT&T
- - Widely used operating system
- - Computer operating system since the '60s
- - Basis of the Solaris Operating System
- - The C programming language was developed for it
- - Original operating system with "grep" searches
- - Popular computer operating system
- - System developed at Bell Laboratories
- - Mainframe operating system
- - System for servers
- - Multiuser computer operating system
- - Multi-user operating system
- - Popular multi-user operating system
- - Operating system popular on the Net
- - Computer operating system developed at AT&T
- - Popular operating system
- - Computer O/S
- - Computer system developed at AT and T
- - Operating system
- - Workstation operating system
- - 40-Across operating system, usually
- - Old-school operating system
- - family of computer operating systems developed at bell labs in the 1970s
- - Detach coreless operating system
- - OS developed by Bell Labs
- - OS that uses emacs, sudo and chmod commands
- - Ken Thompson helped develop it
- - Its letters are contained in "Linux"
- - Bell Labs invention
- - Programmer's language
- - Windows alternative
- - Alternative to Linux
- - Ma Bell invention
- - Alternative to Windows
- - DOS alternative
- - What macOS is based on
- - Linux forerunner
- - OS X basis
- - Alternative to DOS or Windows
- - Mac OS X is based on it
- - Bell Labs creation
- - Model for many operating systems
- - It has "batch" and "patch" commands
- - MS-DOS alternative
- - DOS rival
- - Servers run it, often
- - Alternative to DOS
- - OS choice
- - Linux alternative
- - Basis of Mac OS X
- - AT&T used to own it
- - Language many Americans prefer using
- - Sysadmin's area of expertise
- - Server's language
- - It was developed by AT&T and Bell Labs
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- [ Other definitions ]