Early operating system
The crossword clue "Early operating system" is answered by UNIX, a 4-letter entry. Used 10 times across 7 distinct years; most recently in 2026; first recorded in 2019. It appears in 6 publications in the xd corpus. Every figure on this page comes from the collection data itself, never from a guess.
The answer
UNIX
4 letters. See every clue for this answer on the UNIX answer page.
Used 10 times across 7 distinct years; most recently in 2026; first recorded in 2019. It appears in 6 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other answers for this clue
The same clue has also been answered these ways in the xd corpus. Answers inside this collection link to their own answer page.
Other clues for UNIX
Every other clue in this collection answered by UNIX, most used first.
- Windows alternative - used 47 times, most recently in 2026
- Computer operating system - used 32 times, most recently in 2018
- Alternative to Windows - used 20 times, most recently in 2014
- Operating system developed at Bell Labs - used 20 times, most recently in 2026
- Alternative to DOS or Windows - used 10 times, most recently in 2016
- Operating system on many Internet servers - used 10 times, most recently in 2023
- Server system - used 8 times, most recently in 2026
- Bell Labs operating system - used 7 times, most recently in 2025
Related clues
Clues in this collection of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Early Peruvian - INCA, used 90 times
- Early automaker - OLDS, used 46 times
- Early birds? - EGGS, used 44 times
- Early video game - PONG, used 41 times
- Early pulpit - AMBO, used 32 times
- Early Ron Howard role - OPIE, used 28 times
Search the clue collection
Search by clue words or by answer, or type a pattern with the letters you have and a blank for each square you do not know. The characters _ ? . and - all work as blanks.