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If you want to find the version of the server:
$ redis-server -v
For example in my system I get this result:
Redis server v=2.8.4 sha=00000000:0 malloc=libc bits=64 build=92637893332b8579
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If you want to get the version of the client:
$ redis-cli -v
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If you want to know the version of the server, from the client:
> INFO
and the first line is the version of the Redis server.