mvkeys.sh

#!/bin/bash
# Move all keys in Redis db $1 to db $2
if [ $# != 2 ] ; then
  echo "Usage: $0 <db1> <db2>"
  exit 1
fi
from=$1
to=$2
testarg () {
  regex='^(0|[1-9][0-9]*)$'
  if ! [[ "$1" =~ $regex ]] ; then
    echo "$1 is invalid value, should be an integer between 0 and 15 inclusive"
    exit 1
  fi
  if [[ "$1" -lt 0 || "$1" -gt 15 ]] ; then
    echo "From/To should be between 0 and 15 inclusive"
    exit 1
  fi
}

testarg $from
testarg $to

if [[ $from -eq $to ]] ; then
  echo "From and To should not be the same"
  exit 1
fi

redis-cli -n $1 keys '*' | sed -e 's/^/MOVE "/' -e "s/\$/\" $2/" | redis-cli -n $1 > /dev/null