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redis 127.0.0.1:6379> RENAME OLD_KEY_NAME NEW_KEY_NAME

# Key exists and newkey does not exist

redis> SET message "hello world"
OK

redis> RENAME message greeting
OK

redis> EXISTS message               # message no longer exists
(integer) 0

redis> EXISTS greeting              # greeting takes its place
(integer) 1


# Returns an error when the key does not exist

redis> RENAME fake_key never_exists
(error) ERR no such key


# RENAME overwrites the old newkey when newkey already exists

redis> SET pc "lenovo"
OK

redis> SET personal_computer "dell"
OK

redis> RENAME pc personal_computer
OK

redis> GET pc
(nil)

redis:1> GET personal_computer      # The original value 'dell' is overwritten
"lenovo"