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Remove:
touch .hushlogin

Get it back:
rm .hushlogin

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cd /proc/<pid> && echo -n "Max open files=65535:65535" > limits

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import java.io.IOException
import java.nio.ByteBuffer
import java.nio.channels.{AsynchronousFileChannel, CompletionHandler}
import java.nio.file.Paths
import java.nio.file.StandardOpenOption._

import scala.concurrent.{ExecutionContext, Future, Promise}
import scala.util.Try

/**

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require 'rubygems'
require 'aws-sdk'

puts "\nLoading instances..."
if File.exist?('instances.yaml')
  instances_by_id = YAML.load_file('instances.yaml')
  puts "Loaded %d instances from instances.yaml" % [instances_by_id.count]
else
  instances_by_id = Hash.new
  ec2 = AWS::EC2.new

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# Nginx - logrotate & upload to S3
0 0 * * * /usr/sbin/logrotate /etc/logrotate.d/nginx 
15 0 * * * s3cmd put /var/log/nginx/access.log-`date +"\%Y\%m\%d"`.gz s3://$LOGS_BUCKET_NAME/nginx-access/`date +"dt=\%Y\%m\%d"`/`hostname -s`.access.log-`date +"\%Y\%m\%d"`.gz

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git format-patch HEAD~X --stdout > patch
git apply --stat patch
git apply --reject --whitespace=fix patch

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import spark.implicits._
import org.apache.spark.sql.functions.udf
import org.apache.spark.sql._
import org.apache.spark.sql.functions._
import org.apache.spark.sql.execution.debug._

val u = udf((a: Int) => a)
val df = spark.sparkContext.parallelize(Seq(0)).toDF("0")

val res = (1 until 20).foldLeft(df) { case (d, i) =>

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package rs

import scala.language.higherKinds

import matryoshka.data._
import matryoshka.implicits._
import scalaz._, Scalaz._

trait Expr[A]
case class NumLit[A](value: Int) extends Expr[A]

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1.
# vim /etc/sysctl.conf
fs.file-max = 999999
net.ipv4.tcp_rmem = 4096 4096 16777216
net.ipv4.tcp_wmem = 4096 4096 16777216
net.ipv4.ip_local_port_range = 1024 65535

2.
# vim /etc/security/limits.conf
root	- nofile 999999

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import scala.util.Random
import java.security.SecureRandom
import java.util.concurrent.atomic.AtomicLong
import org.joda.time.DateTimeUtils

/**
 * 64 bit unique id generator
 * Features:
 * 1. generate ascending or descending ids
 * 2. 64 bit id consists of: