Answer: unix

AnswerCrossword Clue
UNIXBell Labs system
UNIXOperating system
UNIXLanguage many Americans prefer using
UNIXOperating system option
UNIXServers run it, often
UNIXOS choice
UNIXOperating system used since the 1970s
UNIXLongtime computer operating system
UNIXIt has "batch" and "patch" commands
UNIXComputer system developed at Bell Labs
UNIXBell Labs operating system
UNIXOperating system since 1969
UNIXComputer operating system developed at Bell Labs
UNIXSystem for servers
UNIXPopular computer operating system
UNIXComputer operating system developed by Bell Labs
UNIXWidely used operating system
UNIXThe C programming language was developed for it
UNIXSystem developed by Bell Labs
UNIXOperating system with many clones
UNIXSystem used by servers
UNIXLinux forerunner
UNIXOperating system since the early '70s
UNIXCertain operating system
UNIXEarly operating system
UNIXOperating system from Bell Labs
UNIXPioneering computer operating system
UNIXOriginal operating system with "grep" searches
UNIXOperating system developed by Bell Labs
UNIXModel for many operating systems
UNIXOperating system popular on the Net
UNIXPopular operating system
UNIXPC operating system
UNIXComputer O-S
UNIXOperating system choice
UNIXSystem developed at Bell Laboratories
UNIXLinux alternative
UNIXPopular multi-user operating system
UNIXBasis of Mac OS X
UNIXComputer workstation operating system