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jeffrade /
Last active Mar 5, 2020
Bash script that checks for IP change and updates Route53
# Usage: Launch in the background and pass RECORD_SET_NAME (e.g.
# as a first argument for the Route53 record. Log file can be found at /var/tmp/r53-record.log
jeffrade /
Created Sep 11, 2019
Install Kafka on CentOS 7
echo "Starting..."
cd ~/
tar -xzvf openjdk-12.0.1_linux-x64_bin.tar.gz
echo "PATH=$PATH:$HOME/jdk-12.0.1/bin" >> ~/.bash_profile
echo "export PATH" >> ~/.bash_profile
echo "export JAVA_HOME=$HOME/jdk-12.0.1" >> ~/.bash_profile
jeffrade /
Created Jul 13, 2019
bitcoind systemd service and start script.
# Just a simple wrapper to start bitcoind.
# If using systemd, simply create a file (e.g. /etc/systemd/system/bitcoind.service)
# from example file below and add this script in ExecStart.
# Then run following to always start:
# systemctl enable bitcoind
jeffrade /
Last active Feb 6, 2020
Running a Bitcoin Core Full Node - Additional Installation Notes

Addtional Setup and Installation Notes for Running a Full Node (Linux)

  • Install fail2ban
  • (Optional) Block data is getting larger (although at a slower pace), so you might be mounting an external drive to .bitcoin dir. If so follow these steps:
   # You want this to auto mount on reboot (or else you'll have to manually mount every time):
 - `sudo blkid` # Make note of the UUID of your drive
 - `sudo vim /etc/fstab` # Append additional entry and your mount directory (easy to default to `$HOME/.bitcoin`)
    e.g. `UUID=<hexadecimal-dashed-uuid> /home/<your-user-name>/.bitcoin/ ext4 defaults 0 0` 
 - `sudo mount -a` # Test this, you'll get errors if any
jeffrade /
Created Jun 30, 2019
Install fail2ban on Debian Linux
#!/bin/sh -x
echo "Starting..."
apt-get install -y fail2ban
systemctl start fail2ban
systemctl enable fail2ban
> /etc/fail2ban/jail.local
jeffrade / list_fun.ex
Created Jun 24, 2019
Tail recursive implementaion of doubling every other number in a list.
View list_fun.ex
defmodule ListFun do
def double_every_other([], acc), do: acc
def double_every_other([head | nil], acc) do
new_acc = [head * 2 | acc]
double_every_other([], new_acc)
def double_every_other([head | tail], acc) when length(tail) == 0 do
jeffrade / recursion.ex
Created Jun 11, 2019
Tail recursion is optimized way to do recursion in Elixir
View recursion.ex
defmodule Recursion do
@moduledoc """
Showing how tail recursion is optimized way to do recursion (i.e. no memory loss since function calls not kept on stack).
def correct_tail_recursion_adding([head | tail], accumalator) do
correct_tail_recursion_adding(tail, accumalator + head)
def correct_tail_recursion_adding([], accumulator) do
jeffrade /
Last active Feb 19, 2019
Bash script that will pop a line item for a file and pass it to a command.
echo "Starting..."
param=`sed -e 1$'{w/dev/stdout\n;d}' -i~ params.out`
while [[ -n $param ]]; do
echo "Starting process for $param..."
<some-command> $param &
curr_pid=`echo $!`
jeffrade /
Last active Feb 3, 2019
Bash Script (infinite loop) to Upload Files to AWS S3 Glacier
echo "Running..."
while :; do
echo "Finding oldest file..."
jeffrade /
Last active Sep 11, 2019
Bash script to check certificate information - uses openssl.
if [ -z "$1" ]
echo "Please supply a domain, e.g."
exit 1
echo | openssl s_client -servername $1 -connect $1:443 2>/dev/null | openssl x509 -text
echo "Saving public ./cert.pem..."
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