mysqladmin -u user1 -p password "newpassword"

Shell Command

/etc/init.d/mysqld stop

wait until MySQL stops, then run the following commands :

mysqld_safe --skip-grant-tables &

Then you will be you will be able to login as root with no password.

mysql -uroot mysql

In MySQL command prompt use the following commands :

use mysql;
update user set password=PASSWORD("newrootpassword") where User='root';
FLUSH PRIVILEGES;

Restart MySQL :

/etc/init.d/mysqld stop

/etc/init.d/mysqld start

Example :

Suppose we have two tables student and mark :
Student
id     | integer |
name   | text    |

Mark
id     | integer |
name   | text    |
mark | integer |

We can copy all values of student to mark by using the following query :

insert into mark select * from student;
 id | name  | mark
----+-------+--------
  1 | test  |
  2 | test1 |
  3 | test2 |
  4 | test3 |

We can copy one column of student to mark by using the following query :

insert into mark(name) select name from student

$ find [/path/to/directory/] -name "*.mp3" -print > myplaylist.txt
$ mplayer -playlist myplaylist.txt

2.

cd /etc/sysconfig/network-scripts 

3. Check for existing network adapters with the command:

ls ifcfg-*

4. Copy ifcfg-eth0 to ifcfg-eth0:0

cp ifcfg-eth0 ifcfg-eth0:0

5. Edit the file

vi ifcfg-eth0:0 and change the following lines

   DEVICE=eth0:0
   IPADDR=x.x.x.x (The ip you want to be added to the server)

Another important parameter in this file is the ONBOOT =yes, because if you forget to set this parameter to Yes, after a reboot the ip’s that you had added just now will be lost.

Make sure for permanent addition of the ip in the server that ONBOOT is set to yes.

This can be achieved by using the option -m with wget

for example:

wget -m http://download.inhouse.net/mag_cd/linux4u/Dec06/app_server/jboss/

It will download all the files/folders inside the directory jboss

-r, –recursive Specify recursive download.

-l, –level=NUMBER Maximum recursion depth (inf or 0 for infinite).

-k, –convert-links Make links in downloaded HTML point to local files.

-p, –page-requisites Get all images, etc. needed to display HTML page.

shutdown -h +period

for example:

shutdown -h +48

here the command will shut down the system after 48hrs(2days).
In the mean time, if you want to cancel the shutdown process, execute the following command.

shutdown -c

 <?php echo 'Welcome ', 'to', ' ', 'TechInterviews!'; ?>

and it will output the string “Welcome to TechInterviews!” print does not take multiple parameters. It is also generally argued that echo is faster, but usually the speed advantage is negligible, and might not be there for future versions of PHP. printf is a function, not a construct, and allows such advantages as formatted output, but it’s the slowest way to print out data out of echo, print and printf.

__sleep :- This function is executed prior to any serialization. It can clean up the object and is supposed to return an array with the names of all variables of that object that should be serialized. If the method doesn’t return anything then NULL is serialized and E_NOTICE is issued.

__wakeup :- The intended use of __wakeup is to reestablish any database connections that may have been lost during serialization and perform other reinitialization tasks.

__toString :- The __toString method allows a class to decide how it will react when it is converted to a string.

__invoke :- The __invoke method is called when a script tries to call an object as a function.

__set_state :- This static method is called for classes exported by var_export() since PHP 5.1.0.

The only parameter of this method is an array containing exported properties in the form array(‘property’ => value, …).

__construct :- PHP 5 allows developers to declare constructor methods for classes. Classes which have a constructor method call this method on each newly-created object, so it is suitable for any initialization that the object may need before it is used.

__destruct :- PHP 5 introduces a destructor concept similar to that of other object-oriented languages, such as C++. The destructor method will be called as soon as all references to a particular object are removed or when the object is explicitly destroyed or in any order in shutdown sequence.

__call :- It is triggered when invoking inaccessible methods in an object context.

__callStatic :- It is triggered when invoking inaccessible methods in a static context.

__set :- __set() is run when writing data to inaccessible properties.

__get :- __get() is utilized for reading data from inaccessible properties.

__isset :- __isset() is triggered by calling isset() or empty() on inaccessible properties.

__unset :- __unset() is invoked when unset() is used on inaccessible properties.

__clone :- An object copy is created by using the clone keyword (which calls the object’s __clone() method if possible). An object’s __clone() method cannot be called directly.

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