Redis SYNC command is used to sync slave to master.
Simple string reply.
Following is the basic syntax of Redis SYNC command.
redis 127.0.0.1:6379> SYNC
redis 127.0.0.1:6379> SYNC Entering slave output mode... (press Ctrl-C to quit) SYNC with master, discarding 18 bytes of bulk transfer... SYNC done. Logging commands from master. "PING" "PING" "PING" "PING"