prevent apache, mysql by default starting

After install apache & mysql, they will be started automatically when you login. To prevent it, just do simple code

sudo update-rc.d -f mysql remove

sudo update-rc.d -f apache2 remove

some trick with ls command

i use ls command very frequently, and here are some tricks
1. list only directory:

• ls -l | grep “^d”
• find . -type d -maxdepth 1 -mindepth 1
• ls -d */

2. list only file

• find . -type f -maxdepth 1
• find . -type f -maxdepth 1 \( ! -iname ".*" \)

amazing with python (string)

developers = set(['tuan', 'chau', 'hung', 'hoang', 'hoan'])
managers = set(['hoang', 'ngoc'])

* find manager who coding

managers & developers

* find manager who not coding

managers - developers

* find all

managers | developers

happy coding

backup and restore mysql in ubuntu

although i use ubuntu with shell, you can use whatever linux's distribution, command should like the same

backup mysqlmysqldump -u [username] -p [password] [database'name] > [backup'sname]
exp: mysqldump -u root -p 123 mysite > mysite.bak.sql


restore from file backupmysql -u [username] -p [password] [database'name] < [backup'sname]

note that the only different is mysql <> mysqldump and > <> <exp: mysql -u root -p 123 mysite < mysite.bak.sql
click here for more details

happy coding!

code it better guys!

here is the slide which i made for reviewing code of php's team