Vedis Built-in Commands - Key/Value.
Decrements the number stored at key by decrement. If the key does not exist, it is set to 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer. This operation is limited to 64 bit signed integers.
Refer to the download page for some C/C++ samples on how to invoke this command from your host application.
vedis> DECRBY test 5
vedis> GET test