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+Set `key` to hold the string `value` and set `key` to timeout after a given
+number of seconds. This command is equivalent to executing the following
+commands:
+
+```
+SET mykey value
+EXPIRE mykey seconds
+```
+
+`SETEX` is atomic, and can be reproduced by using the previous two commands
+inside an `MULTI` / `EXEC` block. It is provided as a faster alternative to the
+given sequence of operations, because this operation is very common when Redis
+is used as a cache.
+
+An error is returned when `seconds` is invalid.
+
+@return
+
+@simple-string-reply
+
+@examples
+
+```cli
+SETEX mykey 10 "Hello"
+TTL mykey
+GET mykey
+```