duan-li

open ~/.bashrc in text editor and uncomment line:

#force_color_prompt=yes

to be:

force_color_prompt=yes

duan-li

# Exception Handling
def spam(divideBy):
    return 42 / divideBy

try:
    print(spam(2))
    print(spam(12))
    print(spam(0))
    print(spam(1))
except ZeroDivisionError:

duan-li

#download
youtube-dl -F <URL> # see all format
youtube-dl -f <format> <URL> # download format

# DASH decode
ffmpeg -i input.m4a -vn -acodec copy output.m4a # Solve: writing DASH m4a. Only some players support this container. Install ffmpeg or avconv to fix this automatically.

#mp3
ffmpeg -codecs help | grep 'mp3' # check mp3 codecs
ffmpeg -i input.m4a -acodec libmp3lame -ab 128k output.mp3

duan-li

sudo service beanstalkd stop
sudo service supervisor stop
sudo service memcached stop
sudo service hhvm stop

duan-li

<?php
// ref: http://stackoverflow.com/questions/356128/can-i-extend-a-class-using-more-than-1-class-in-php
class B {
    public function method_from_b($s) {
    	echo $s;
    }
}

class C {
    public function method_from_c($s) {

duan-li

[mysqld]
skip-log-bin
innodb_file_per_table=1
expire_logs_days        = 1
max_binlog_size         = 10M
#use following detail to clean everything about bin log
#PURGE BINARY LOGS TO 'mysql-bin.000029';
#RESET MASTER;

duan-li

select count(id), join_datetime from customers
where status > 0
group by DATE(join_datetime)
order by join_datetime desc


select count(id), join_datetime from customers
where status > 0
group by MONTH(join_datetime)
order by join_datetime desc

duan-li

<IfModule mod_ssl.c>
	<VirtualHost *:443>
		ServerAdmin webmaster@localhost
		ServerName domain.com.au
		DocumentRoot /path-to-www
		SuexecUserGroup web-data web-data
		#LogLevel info ssl:warn
		ErrorLog ${APACHE_LOG_DIR}/error-ssl-html.log
		CustomLog ${APACHE_LOG_DIR}/access-ssl-html.log combined

duan-li

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'dbpassword' WITH GRANT OPTION;
FLUSH PRIVILEGES;

duan-li

#!/bin/bash
if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi


CURRENT_USER=$(id -u -n)
CURRENT_GROUP=$(id -g -n)
CURRENT_USER_HOME=$(eval echo ~${SUDO_USER})