n-johnson

# Speed up slow apt default server
ENV DIST=xenial
RUN echo "deb mirror://mirrors.ubuntu.com/mirrors.txt $DIST main restricted universe multiverse\ndeb mirror://mirrors.ubuntu.com/mirrors.txt $DIST-updates main restricted universe multiverse\ndeb mirror://mirrors.ubuntu.com/mirrors.txt $DIST-backports main restricted universe multiverse\ndeb mirror://mirrors.ubuntu.com/mirrors.txt $DIST-security main restricted universe multiverse\n$(cat /etc/apt/sources.list)" > /etc/apt/sources.list

n-johnson

const fs = require('fs')
const rocambole = require('rocambole');

// Use espree instead of esprima - about twice as fast
const espree = require('espree');
rocambole.parseFn = espree.parse;
rocambole.parseContext = espree;

const parseTime = (delta) => (delta[0] * 1000 + delta[1] / 1e6) + 'ms'

n-johnson

#!/bin/bash
# Takes a parameter PREFIX and then prepends it to all stdin passed through

PREFIX="$1"

awk -v p="$PREFIX" '{ print "\033[90m[" p "]\033[0m" , $0; fflush(); }'

n-johnson

#!/bin/bash

MAX_CACHE=21600 # 6 hours (sec)
EC2_CACHE="$HOME/.ec2_host"

file_age() {
  stat -f "%Sm" -t "%s" "$1"
}

cur_time=$(date "+%s")

n-johnson

#!/bin/bash

stat -f "%Sm" -t "%m-%d-%y %H:%M:%S" "$1"

n-johnson

#!/bin/bash

# byte_range $start $end
#   - Outputs the bytes between the starting and ending values from the stdin stream
#
#     - $start - Starting byte to display
#     - $end   - Ending byte to display

isInteger() {
  local regex_numeric='^[0-9]+$'

n-johnson

perl -MTime::HiRes -e 'printf("%.0f\n",Time::HiRes::time()*1000)'

n-johnson

#!/bin/bash

host01_temp() {
  local key="host01.cpu.temp"
  local temp=$(ssh stats@10.0.0.1 sensors | grep 'Physical id' | awk -F':' '{print $2 }' | awk '{print $1}' | tr -d '+' | tr -d '°C')

  echo "$key $temp"
}

statsd `host01_temp`

n-johnson

Latency Comparison Numbers
--------------------------
L1 cache reference                            0.5 ns
Branch mispredict                             5   ns
L2 cache reference                            7   ns             14x L1 cache
Mutex lock/unlock                            25   ns
Main memory reference                       100   ns             20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy              3,000   ns
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms

n-johnson

# req: prips

curl https://ip-ranges.amazonaws.com/ip-ranges.json \
  | grep -B 2 CLOUDFRONT \
  | grep 'ip_prefix' \
  | awk '{ print $2 }' \
  | tr -d '",' \
  | xargs -I{} prips {}