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- Computer operating system developed at Bell Labs
- DOS rival
- Servers run it, often
- PC operating system
- Bell Labs creation
- Certain operating system
- Operating system since 1969
- MS-DOS alternative
- Company with a penguin mascot
- Mac OS X is based on it
- Linux alternative
- Computer open operating system
- Longtime computer operating system
- It has 'batch' and 'patch' commands
- You get nothing with operating system