linux - Command to list word completions -

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i once found built-in command take prefix argument , return words complete word. example, 

>> command cali california calibrate calibration ........

of course list lot more words, in alphanumerical order. useful, , optionally took file other default in.

i'm not trying produce behavior: there million ways use grep, sed, awk, perl, or insert turing-complete language here this. i'm looking command.

unfortunately it's hard google when don't remember name, while might not have been posix standard common linux utility, know called?

found it: it's called look, , seems have been around unix since v7. (the man page dated 1993!)

it binary search on optional second argument find matches, defaulting /usr/share/dict/words.


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