gzxultra’s gists

gzxultra / install_tmux.sh

Created February 19, 2019 15:52

Install latest version of tmux

	cd ~
	wget https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz
	tar xvzf libevent-2.1.8-stable.tar.gz
	cd libevent-2.1.8-stable
	./configure --prefix=$HOME/bin --disable-shared
	make
	make install

	cd ~
	wget https://invisible-mirror.net/archives/ncurses/ncurses-6.1.tar.gz

gzxultra / upgrade_gcc.sh

Created January 28, 2019 18:53

script to upgrade gcc on a linux server

	#!/bin/bash -l

	# download gcc source code
	cd $HOME
	wget http://mirrors.concertpass.com/gcc/releases/gcc-8.2.0/gcc-8.2.0.tar.gz
	tar -xzf gcc-8.2.0.tar.gz
	cd gcc-8.2.0/
	./contrib/download_prerequisites

	# config makefile

gzxultra / task_schedule.py

Created November 14, 2018 00:04

facebook interview, task schedule

	def calc_task_time1(tasks):
	# use a dict, keep all task last run time
	# more space used, less run time expected
	time = 0
	d = dict()

	for t in tasks:
	if t in d:
	last = d[t]
	time = max(last + n, time) + 1

gzxultra / calc_gps_distance.py

Created September 24, 2018 21:29

calc gps distance

	def calc_distance(lat1, lng1, lat2, lng2):
	""" 城市内距离计算函数，这里是简化了 Haversine 公式，单位是米
	在一个城市的范围内，可以近似认为经线和纬线是垂直的
	"""
	dx = lng1 - lng2 # 经度差值
	dy = lat1 - lat2 # 纬度差值
	b = (lat1 + lat2) / 2.0 # 平均纬度
	lx = math.radians(dx) * 6367000.0 * math.cos(math.radians(b)) # 东西距离
	ly = 6367000.0 * math.radians(dy) # 南北距离
	return math.sqrt(lx * lx + ly * ly) # 用平面的矩形对角距离公式计算总距离

gzxultra / hoosier_court_daily_expense_calc.py

Last active August 8, 2018 03:41

calc our daily expense

	import datetime


	class People:

	def __init__(self, name):
	self.name = name


	class Transaction:

gzxultra / fix_no_package_repo.md

Created February 19, 2018 08:54

Fix Not found Package Repository Errors

通过修改  /etc/apt/sources.list 来把链接指向旧的版本仓库
以下实例代码将/etc/apt/sources.list中的所有 archive.ubuntu.com  和 security.ubuntu.com替换成  old-releases.ubuntu.com
sudo sed -i -e 's/archive.ubuntu.com\|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list  
再看看有没有  /etc/apt/sources.list.d/ 这个文件，可以把这个文件一起修改
grep -E 'archive.ubuntu.com|security.ubuntu.com' /etc/apt/sources.list.d/*  
sudo apt-get update

gzxultra / healcare.sql

Last active December 10, 2017 13:18

tables for healcare project

	CREATE TABLE `healthcare_center_employees` (
	`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
	`name` varchar(100) NOT NULL,
	`ssnNumber` char(20) NOT NULL,
	`address` varchar(200) NOT NULL,
	`phone` char(20) NOT NULL,
	`email` varchar(200) NOT NULL,
	`pastAndCurrentJobTitle` varchar(100) NOT NULL,
	`salary` double(16, 4) NOT NULL,
	`benefits` text NOT NULL,

gzxultra / scrapy.py

Last active December 8, 2017 13:33

scrapy.py

	# coding: utf-8
	import requests
	import re
	import hashlib
	import simplejson

	from bs4 import BeautifulSoup

	requests.adapters.DEFAULT_RETRIES = 10
	session = requests.session()

gzxultra / progress_bar.py

Created November 16, 2017 07:25

examples using progress bar

	```python

	from ec.broker.user_persona import update_user_persona
	from mysite.model.user import User
	from mysite.model.const.user import STATE_ACTIVE
	from mysite.util.orm import ormiter
	from progress.bar import Bar


	if __name__ == '__main__':

gzxultra / mysql_operation.sql

Last active September 30, 2017 08:16

create user grant privileges

	```sql
	CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';
	GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost';
	FLUSH PRIVILEGES;

	GRANT ALL PRIVILEGES ON DB_NAME.* TO user_name@'%';
	```

Zhixiang gzxultra