How to add expiry to a key in Redis?

You can add an expiry (time-to-live) to a key in Redis using the EXPIRE or EXPIREAT command. Here are the steps to add an expiry to a key in Redis:

Connect to your Redis server using the redis-cli command-line interface.
Use the SET command to set the value of the key you want to expire. For example:
```
SET mykey "Hello Redis"
```
Use the EXPIRE command to set the expiry time for the key in seconds. For example, to set the key mykey to expire after 60 seconds, you can run:
```
EXPIRE mykey 60
```
This command sets the key mykey to expire after 60 seconds. Once the expiry time is reached, the key will automatically be deleted from the Redis database.
Alternatively, you can use the EXPIREAT command to set the expiry time for the key as an absolute Unix timestamp (in seconds since January 1, 1970). For example, to set the key mykey to expire at midnight on January 1, 2024, you can run:
```
EXPIREAT mykey 1704067200
```
This command sets the key mykey to expire at the Unix timestamp 1704067200.

Note that you can also use the SETEX command to set a key with an expiry time in a single command. The SETEX command sets the value of a key and its expiry time in a single atomic operation. For example, to set the key mykey to expire after 60 seconds, you can run:


SETEX mykey 60 "Hello Redis"

This sets the value of the key mykey to "Hello Redis" and its expiry time to 60 seconds in a single command.

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