JDBC連不上MySQL主機

網外電腦要用JDBC連接MySQL主機時，出現
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
的錯誤時，在MySQL主機上：

sudo vim /etc/mysql/my.cnf

把bind-address給註解掉：

#bind-address = 127.0.0.1

然後存檔，mysql重新啓動：

sudo /etc/init.d/mysql restart

就可以連了！

How to download youtube videos on OSX

1.Install youtube-dl

$ brew install youtube-dl

2. List the downloadable videos

$ youtube-dl -F url:youtube.videos

160          mp4        256x144    DASH video  108k , avc1.4d400b, 30fps, video only

133          mp4        426x240    DASH video  242k , avc1.4d400c, 30fps, video only

134          mp4        640x360    DASH video  604k , avc1.4d401e, 30fps, video only

135          mp4        854x480    DASH video 1100k , avc1.4d4014, 30fps, video only

136          mp4        1280x720   DASH video 2200k , avc1.4d4016, 30fps, video only

137          mp4        1920x1080  DASH video 4125k , avc1.64001e, 30fps, video only

17           3gp        176x144    small ,  mp4a.40.2, mp4v.20.3

36           3gp        320x240    small ,  mp4a.40.2, mp4v.20.3

3.Download one of the videos by code

$ youtube-dl -f 137 url:youtube.videos

refer:https://github.com/rg3/youtube-dl/blob/master/README.md#readme

remove netbeans 8.1 on Lubuntu

cd /usr/local/netbeans-8.1
sudo ./uninstall.sh

php 5.5.9 升級至 5.6

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:ondrej/php5-5.6
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install php5