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redis 127.0.0.1:6379> SET KEY_NAME VALUE

# Setting a non-existing key

redis 127.0.0.1:6379> SET key "value"
OK

redis 127.0.0.1:6379> GET key
"value"

# Setting an existing key

redis 127.0.0.1:6379> SET key "new-value"
OK

redis 127.0.0.1:6379> GET key
"new-value"