kei-sato

export PKG_CONFIG_PATH=/usr/lib64/pkgconfig:/usr/lib/pkgconfig
export PATH=/usr/bin:$PATH
export LDFLAGS=-L/usr/lib64:/usr/lib
export LD_LIBRARY_PATH=/usr/lib64:/usr/lib
export CPPFLAGS=-I/usr/include

PREFIX=/usr

sudo yum-config-manager --enable epel
sudo yum -y update && sudo yum -y upgrade

kei-sato

#!/usr/bin/env python3

"""
Using Fermat's little theorem to calculate nCk mod m, for k < m and m is prime

Two versions:
1. Pre-Compute factorials and multiplicative inverses in O(n*logn) --> later lookup in O(1)
2. Compute directly --> no lookup --> each time O(n)
"""

kei-sato

#!/usr/bin/env node

/*

# Usage

```
: list objects
node aws-sdk-tips.js -b bucket-name -k path/to/dir

kei-sato

# : how to create key pair which is used to ssh login to ec2 instances
# keypair_name=mykey1
# ssh-keygen -t rsa -f ~/.ssh/${keypair_name}
# aws ec2 import-key-pair --key-name ${keypair_name} --public-key-material file://$HOME/.ssh/${keypair_name}.pub

# : modify these variables to fit your situation
# StackName=ec2-run-instance
# yaml2json > /tmp/parameters.json << 'EOF'
# - ParameterKey: KeyName
#   ParameterValue: mykey1

kei-sato

server {
    listen 80;
    charset utf-8;

    auth_basic "Restricted";
    auth_basic_user_file /etc/nginx/.htpasswd;

    location / {
        root /usr/share/nginx/html;
        index index.html;

kei-sato

# https://github.com/docker/distribution/blob/master/docs/configuration.md
# https://github.com/docker/distribution/blob/master/cmd/registry/config-example.yml

# usage:
# docker run -d -p 5000:5000 --name registry \
# -v /path/to/this/config.yml:/etc/docker/registry/config.yml \
# -e REGISTRY_STORAGE_S3_ACCESSKEY= \
# -e REGISTRY_STORAGE_S3_SECRETKEY= \
# -e REGISTRY_STORAGE_S3_REGION= \
# -e REGISTRY_STORAGE_S3_BUCKET= \

kei-sato

#!/usr/bin/env bash

# read from argument or stdin
mask="$1"; [[ -z "$mask" ]] && read -r mask < /dev/stdin
# remove 0x
mask="${mask##0x}"

count=0

while [ "$mask" != "" ]; do

kei-sato

#!/usr/bin/env ruby

# https://goo.gl/JJ8BaU
class Integer
  def prime?
    n = self.abs()
    return true if n == 2
    return false if n == 1 || n & 1 == 0
    d = n-1                                 # nは奇数だからdは偶数
    d >>= 1 while d & 1 == 0                # n-1 = d * 2^s

kei-sato

#!/usr/bin/env bash
# reverse arp

USAGE='
Example:
rarp 00:0a:95:9d:68:16
=> 192.168.0.253
'

abort() {

kei-sato

#!/usr/bin/env bash

set -e

abort() { echo "$@" 1>&2; exit 1; }

USAGE="
Usage: $0 [-xhn] [-c CAL_NUMBER] [-i INTERVAL] [-t DURATION] (-D DATETIME | -S SECONDS | -M MINUTES | -H HOURS | -d DAYS) TITLE
-x) Debug (show all commands)
-h) help