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cabal

Installing library

cabal update && cabal new-install --lib codeworld-api

lists

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Safest way to clean up boot partition - Ubuntu 14.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r 

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# converting java keystore to .pem
# https://www.calazan.com/how-to-convert-a-java-keystore-jks-to-pem-format/
# https://stackoverflow.com/questions/652916/converting-a-java-keystore-into-pem-format

rm cert*

command apg -m 30 -n 1 > pass.txt

keytool -importkeystore \
  -srckeystore keystore.jks \

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Open port 1780

iptables -A INPUT -p tcp --dport 1780 -j ACCEPT

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import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.AlgorithmParameters;
import java.security.GeneralSecurityException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;

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# extended desktop
xrandr --output eDP-1 --mode 1920x1080  --output DP-1-1 --auto --right-of eDP-1 --output DP-1-3 --auto --right-of DP-1-1

# mirror all
xrandr --output eDP-1 --mode 1920x1080  --output DP-1-1 --auto --same-as eDP-1 --output DP-1-3 --auto --same-as eDP-1

# switch off all external monitors
xrandr --output eDP-1 --mode 1920x1080  --output DP-1-1 --off --output DP-1-3 --off

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import java.security.Provider;
import java.security.Security;
import java.util.Arrays;
import javax.crypto.Cipher;

public class ShowCryptoProviders
{
  private static final String EOL = System.getProperty("line.separator");

  public static void main(final String[] args)

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Remove dangling images

docker image prune

Remove dangling volumes

docker volume prune

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sudo apt-get install software-properties-common

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

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#!/usr/bin/env python3
"""
Generate a random IPv4 address for a specified subnet
"""

from random import seed, getrandbits
from ipaddress import IPv4Network, IPv4Address
import argparse

parser = argparse.ArgumentParser(description='Generate a random IPv4 address for a specified subnet')