redis-migrate.sh

#set connection data accordingly
source_host=localhost
source_port=6379
source_db=0
target_host=localhost
target_port=6379
target_db=1

#copy all keys without preserving ttl!
redis-cli -h $source_host -p $source_port -n $source_db keys \* | while read key;
do 
  echo "Copying $key";
  redis-cli --raw -h $source_host -p $source_port -n $source_db DUMP "$key" | head -c -1 | redis-cli -x -h $target_host -p $target_port -n $target_db RESTORE "$key" 0; 
done