TTL key

Time complexity: O(1)

Returns the remaining time to live of a key that has a timeout. This introspection capability allows a Redis client to check how many seconds a given key will continue to be part of the dataset.

Starting with Redis 2.8 the return value in case of error changed:

See also the command that returns the same information with milliseconds resolution (Only available in Redis 2.6 or greater).

*Examples

redis> SET mykey "Hello"

redis> EXPIRE mykey 10