Redis INCRBYFLOAT command is used to increment the string representing a floating point number, stored at the key by the specified increment. If the key does not exist, it is set to 0 before performing the operation. If the key contains a value of the wrong type or the current key content or the specified increment are not parsable as floating point number, then an error is returned.
String reply, the value of the key after the increment.
Following is the basic syntax of Redis INCRBYFLOAT command.
redis 127.0.0.1:6379> INCRBYFLOAT KEY_NAME INCR_AMOUNT
redis 127.0.0.1:6379> SET visitors 1000.20 OK redis 127.0.0.1:6379> INCRBYFLOAT visitors .50 1000.70 redis 127.0.0.1:6379> GET visitors 1000.70