What are the main key operations available in Redis?

The following main operations on keys are available in Redis:

• SET key value — set the value of a key.
• GET key — get the value of a key.
• DEL key [key ...] — delete one or more keys.
• EXISTS key [key ...] — check if a key exists.
• EXPIRE key seconds — set the lifetime of a key in seconds.
• TTL key — get the remaining lifetime of a key.
• KEYS pattern — get a list of keys matching a pattern (not recommended for production due to performance issues).
• SCAN cursor [MATCH pattern] [COUNT count] — iterative search for keys with optional filtering.
• RENAME key newkey — rename a key.
• TYPE key — find out the type of the value stored at a key.

Example of usage in Python with the redis library:

import redis

r = redis.Redis()
r.set('mykey', 'value')
value = r.get('mykey')
r.expire('mykey', 60)  # the key will expire in 60 seconds
keys = r.keys('*')