script to rename lots of redis keys

rename-redis-keys.js

var Redis = require('redis-stream')
  , client = new Redis(6379, 'localhost', process.argv[2] || 0)
  , stream = client.stream()

var keys = client.stream('keys')

process.stdin
  .pipe(Redis.es.split())
  .pipe(keys)
  .pipe(Redis.es.mapSync(function (key) { 
    var newkey = key.replace(/user_/, 'users::')     // regex to rename key with
    return Redis.parse([ 'rename', key, newkey ])
  }))
  .pipe(stream.redis)
  .pipe(Redis.es.join('\r\n'))
  .pipe(process.stdout)

console.log('enter a `keys` pattern, e.g. *')