mingfang

#!/bin/bash

while true
do
  if ping -c 1 -w 3 192.168.2.67 &> /dev/null || hcitool scan | grep -q -E "ming-macbook|Ming's iPhone" ; then
    echo "welcome back. turning screen on"
    echo 0 | sudo tee /sys/class/backlight/rpi_backlight/bl_power
  else
    echo "you're gone. turning screen off"
    echo 1 | sudo tee /sys/class/backlight/rpi_backlight/bl_power

mingfang

#!/bin/bash

#Computes the suggested PG count similar to this http://ceph.com/pgcalc/

#Reguirements:
#  - must run on ceph admin
#  - depends on awk, wc and bc commands

#Limitations:
#  - Assumes same OSD# for all pools

mingfang

// DO NOT CHANGE //

const gulp = require('gulp');
const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const gwebpack = require('webpack-stream');
const browserSync = require('browser-sync');
const runSequence = require('run-sequence');
const debug = require('gulp-debug');
const cache = require('gulp-cached');

mingfang

virt-cat -d vm1 /var/lib/dhcp/dhclient.eth0.leases

mingfang

lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL

mingfang

curl -s checkip.dyndns.org | sed -e 's/.*Current IP Address: //' -e 's/<.*$//' 

mingfang

iptables -A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --set --name SSH --rsource
iptables -A INPUT -p tcp -m tcp --dport 22 -m recent --rcheck --seconds 30 --hitcount 4 --rttl --name SSH --rsource -j REJECT --reject-with tcp-reset
iptables -A INPUT -p tcp -m tcp --dport 22 -m recent --rcheck --seconds 30 --hitcount 3 --rttl --name SSH --rsource -j LOG --log-prefix "SSH brute force "
iptables -A INPUT -p tcp -m tcp --dport 22 -m recent --update --seconds 30 --hitcount 3 --rttl --name SSH --rsource -j REJECT --reject-with tcp-reset
iptables -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT

#based on https://rudd-o.com/linux-and-free-software/a-better-way-to-block-brute-force-attacks-on-your-ssh-server

mingfang

openssl rsa -in ~/.ssh/id_rsa -outform pem > id_rsa.pem
chmod 600 id_rsa.pem

mingfang

curl https://build.learnvest.net:5000/v1/search | python -m json.tool

mingfang

boot2docker ssh sudo date --set \"$(env TZ=UTC date '+%F %H:%M:%S')\"