Migrate Redis DB to another place (use MIGRATE COPY for v3.0<= redis)

migrate.sh

#!/bin/bash
# Set connection data accordingly
source_host=localhost
source_port=6379
source_db=1
target_host=localhost
target_port=6379
target_db=2

# 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