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For any of these random password commands, you can either modify them to output a different password length, or you can just use the first n characters of the generated password if you don’t want such a long password.

This method uses SHA to hash the date, runs through base64, and then outputs the top 32 characters.

date +%s | sha256sum | base64 | head -c 32 ; echo

This method used built-in /dev/urandom feature, and filter out only characters that you would normally use in a password. Then it outputs the top 32 characters.

< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-32};echo;

This uses openssl’s rand function, which may not be installed on your system.
For example:

openssl rand -base64 32

This works a lot like the other urandom function, but just does the work in reverse. Bash is very powerful!

tr -cd '[:alnum:]' < /dev/urandom | fold -w30 | head -n1

Here’s another example that filters using the strings command, which outputs printable strings from a file. In this case is the urandom feature.

strings /dev/urandom | grep -o ':alnum:' | head -n 30 | tr -d '\n'; echo

Here’s an even simpler version of the urandom one.

< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c6

This manages to use the very useful dd command.

dd if=/dev/urandom bs=1 count=32 2>/dev/null | base64 -w 0 | rev | cut -b 2- | rev

You can even create a random left-hand password, which would let you type your password with one hand.

</dev/urandom tr -dc '12345!@#$%qwertQWERTasdfgASDFGzxcvbZXCVB' | head -c8; echo ""

If you’re going to be using this all the time, it’s probably a better idea to put it into a function. In this case, once you run the command once, you’ll be able to use randpw anytime you want to generate a random password. You’d probably want to put this into your ~/.bashrc file.

randpw(){ < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;}

You can use this same syntax to make any of these into a function—just replace everything inside the { }

And here’s the easiest way to make a password from the command line, which works in Linux, Windows with Cygwin, and probably Mac OS X. I’m sure that some people will complain that it’s not as random as some of the other options, but honestly, it’s random enough if you’re going to be using the whole thing.

date | md5sum

Step 1: Create a PHP script:

<?php
// Change vars as needed here
$server = "localhost";
$user = "mysql_user";
$pwd = "mysql_password";
$dbName = "mysql_dbName";

$link = mysql_connect($server, $user, $pwd);

if (!$link) {
     die('Could not connect: ' . mysql_error());
}

$db_selected = mysql_select_db($dbName, $link);

if (!$db_selected) {
    die ('Can\'t use $dbName : ' . mysql_error());
}

// Find all tables in the selected DB
$alltables = mysql_query("SHOW TABLES");

// Process all tables.
while ($table = mysql_fetch_assoc($alltables))
{
   foreach ($table as $db => $tablename)
   {
         // Optimize them!
         mysql_query("OPTIMIZE TABLE '".$tablename."'") or die(mysql_error());
   } // end foreach
} // end while

mysql_close($link);
?>

Step 2: Add this script into your daily cron jobs
Login as root and follow these steps to add your new website optimization script to your daily cron directory, thus never having to worry about manually optimizating again!

cd /etc/cron.daily

echo '#!/bin/sh' > mysql_optimize; echo '/path/to/your/script.php' >> mysql_optimize; chmod 755 mysql_optimize;

Now your all set! A quick and easy way to keep your high volume MySQL driven websites optimized!
It is most effective on tables that get updated a lot (with deletions and inserts).

2. echo is faster than print.

3. Use echo’s multiple parameters instead of string concatenation.

4. Set the maxvalue for your for-loops before and not in the loop.

5. Unset your variables to free memory, especially large arrays.

6. Avoid magic like __get, __set, __autoload

7. require_once() is expensive

8. Use full paths in includes and requires, less time spent on resolving the OS paths.

9. If you need to find out the time when the script started executing, INSERT:CONTENT:END SERVER['REQUEST_TIME'] is preferred to time()

10. See if you can use strncasecmp, strpbrk and stripos instead of regex

11. str_replace is faster than preg_replace, but strtr is faster than str_replace by a factor of 4

12. If the function, such as string replacement function, accepts both arrays and single characters as arguments, and if your argument list is not too long, consider writing a few redundant replacement statements, passing one character at a time, instead of one line of code that accepts arrays as search and replace arguments.

13. It’s better to use select statements than multi if, else if, statements.

14. Error suppression with @ is very slow.

15. Turn on apache’s mod_deflate

16. Close your database connections when you’re done with them

17. $row['id'] is 7 times faster than $row[id]

18. Error messages are expensive

19. Do not use functions inside of for loop, such as for ($x=0; $x < count($array); $x) The count() function gets called each time.

20. Incrementing a local variable in a method is the fastest. Nearly the same as calling a local variable in a function.

21. Incrementing a global variable is 2 times slow than a local var.

22. Incrementing an object property (eg. $this->objprop++) is 3 times slower than a local variable.

23. Incrementing an undefined local variable is 9-10 times slower than a pre-initialized one.

24. Just declaring a global variable without using it in a function also slows things down (by about the same amount as incrementing a local var). PHP probably does a check to see if the global exists.

25. Method invocation appears to be independent of the number of methods defined in the class because I added 10 more methods to the test class (before and after the test method) with no change in performance.

26. Methods in derived classes run faster than ones defined in the base class.

27. A function call with one parameter and an empty function body takes about the same time as doing 7-8 $localvar++ operations. A similar method call is of course about 15 $localvar++ operations.

28. Surrounding your string by ‘ instead of ” will make things interpret a little faster since php looks for variables inside “…” but not inside ‘…’. Of course you can only do this when you don’t need to have variables in the string.

29. When echoing strings it’s faster to separate them by comma instead of dot. Note: This only works with echo, which is a function that can take several strings as arguments.

30. A PHP script will be served at least 2-10 times slower than a static HTML page by Apache. Try to use more static HTML pages and fewer scripts.

31. Your PHP scripts are recompiled every time unless the scripts are cached. Install a PHP caching product to typically increase performance by 25-100% by removing compile times.

32. Cache as much as possible. Use memcached – memcached is a high-performance memory object caching system intended to speed up dynamic web applications by alleviating database load. OP code caches are useful so that your script does not have to be compiled on every request

33. When working with strings and you need to check that the string is either of a certain length you’d understandably would want to use the strlen() function. This function is pretty quick since it’s operation does not perform any calculation but merely return the already known length of a string available in the zval structure (internal C struct used to store variables in PHP). However because strlen() is a function it is still somewhat slow because the function call requires several operations such as lowercase & hashtable lookup followed by the execution of said function. In some instance you can improve the speed of your code by using an isset() trick.
Example:

if (strlen($foo) < 5) { echo 'Foo is too short'; }
vs.

if (!isset($foo{5})) { echo 'Foo is too short'; }

Calling isset() happens to be faster then strlen() because unlike strlen(), isset() is a language construct and not a function meaning that it’s execution does not require function lookups and lowercase. This means you have virtually no overhead on top of the actual code that determines the string’s length.

34. When incrementing or decrementing the value of the variable $i++ happens to be a tad slower then ++$i. ++$i happens to be faster in PHP because instead of 4 opcodes used for $i++ you only need 3. Post incrementation actually causes in the creation of a temporary var that is then incremented. While pre-incrementation increases the original value directly. This is one of the optimization that opcode optimized like Zend’s PHP optimizer. It is a still a good idea to keep in mind since not all opcode optimizers perform this optimization and there are plenty of ISPs and servers running without an opcode optimizer.

35. Not everything has to be OOP, often it is too much overhead, each method and object call consumes a lot of memory.

36. Do not implement every data structure as a class, arrays are useful, too

37. Don’t split methods too much, think, which code you will really re-use.

38. You can always split the code of a method later, when needed

39. Make use of the countless predefined functions.

40. If you have very time consuming functions in your code, consider writing them as C extensions

41. Profile your code. A profiler shows you, which parts of your code consumes how many time. The Xdebug debugger already contains a profiler. Profiling shows you the bottlenecks in overview.

• TINYTEXT
• TEXT
• MEDIUMTEXT
• LONGTEXT

MyISAM tables in MySQL have a maximum size of a row of 65,535 bytes, so all the data in a row must fit within this limit.
However, the TEXT types are stored outside the table itself and only contribute 1 to 4 bytes towards this limit.

TEXT data types are also able to store much more data than VARCHAR and CHAR text types so TEXT types are what you need to use when storing web page or similar content in a database.

The maximum amount of data that can be stored in each data type is as follows:

TINYTEXT     256 bytes
TEXT         65,535 bytes        ~64kb
MEDIUMTEXT   16,777,215 bytes    ~16MB
LONGTEXT     4,294,967,295 bytes ~4GB

In most circumstances the TEXT type is probably sufficient, but if you are coding a content management system it’s probably best to use the MEDIUMTEXT type for longer pages to ensure there are no issues with data size limits.

2)”A person should not be too honest. Straight trees are cut first and Honest people are screwed first.”
- Chanakya

3)”Even if a snake is not poisonous, it should pretend to be venomous.”
Chanakya

4)”There is some self-interest behind every friendship. There is no friendship without self-interests. This is a bitter truth.”
- Chanakya

5)” Before you start some work, always ask yourself three questions – Why am I doing it, What the results might be and Will I be successful. Only when you think deeply and find satisfactory answers to these questions, go ahead.”
- Chanakya

6)”As soon as the fear approaches near, attack and destroy it.”
- Chanakya

7)”The world’s biggest power is the youth and beauty of a woman.”
- Chanakya

8)”Once you start a working on something, don’t be afraid of failure and don’t abandon it. People who work sincerely are the happiest.”
- Chanakya

9)”The fragrance of flowers spreads only in the direction of the wind. But the goodness of a person spreads in all direction.”
- Chanakya

10)”God is not present in idols. Your feelings are your god. The soul is your temple.”
- Chanakya

11) “A man is great by deeds, not by birth.”
- Chanakya

12) “Never make friends with people who are above or below you in status. Such friendships will never give you any happiness.”
- Chanakya

13) “Treat your kid like a darling for the first five years. For the next five years, scold them. By the time they turn sixteen, treat them like a friend. Your grown up children are your best friends.”
- Chanakya

14) “Books are as useful to a stupid person as a mirror is useful to a blind person.”
- Chanakya

15) “Education is the best friend. An educated person is respected everywhere. Education beats the beauty and the youth.”
-Chanakya

2. WIPRO : Weak Input, Poor & Rubbish Output

3. HCL : Hidden Costs & Losses

4. TCS : Totally Confusing Solutions

5. INFOSYS : Inferior Offline Systems

6. HUGHES : Highly Useless Graduates Hired for Eating and Sleeping

7. BAAN : Beggars Association and Nerds

8. IBM : Implicitly Boring Machines

9. SATYAM : Sad And Tired Yelling Away Madly

10. C-DOT : Coffee During Office Timings

11. AT&T : All Troubles & Terrible

12. CMC : Coffee, Meals and Comfort

13. DEC : Drifting & Exhausted Computers

14. ORACLE : Online Romance And Chatting with Lady Employees

15. PATNI: Pathetic Appraisal Techniques, No Increments