With Cron, you can run your scripts every minute, but not in shorter period of time.

This problem can be solved with simple bash script. For example, if you need to run a PHP script on every 20 seconds, you can create a bash script like this:

#!/bin/bash
#Name:myscript.sh
#Desc:Run script in every 20 seconds
while (sleep 20 && php /path_to_your_script/your_script_name.php) &
do
 wait $!
done

Then, make script executable, and add it to the system startup. That’s all.

What to do? Someone would press the power button and restart or shut down the system. You shouldn’t do this. This can make you a lot of problems.

What you can do, is to perform a gentle Linux restart.  This is much safer way to restart your frozen Linux.  To do this, you need to press:

Ctrl + Alt + PrtSc (SysRq) + reisub

Just to make it clear. You need to press and hold Ctrl, Alt and PrtSc(SysRq) buttons, and while holding them, you need to press r, e, i, s, u, b

This will restart your Linux safely.

It’s possible that you’ll have problem to reach all the buttons you need to press. I’ve seen people type reisub with their nose

So, here’s my suggestion: With your smallest finger on the left hand, press Ctrl. With your thumb on left hand, press Alt. With the smallest finger on your right hand press PrtSc(SysRq) button. This way, you’ll be able to access to reisub buttons with your other fingers.

Okay, but what this REISUB means? 

• R: Switch the keyboard from raw mode to XLATE mode
• E: Send the SIGTERM signal to all processes except init
• I: Send the SIGKILL signal to all processes except init
• S: Sync all mounted filesystems
• U: Remount all mounted filesystems in read-only mode
• B: Immediately reboot the system, without unmounting partitions or syncing

You can find the complete list here. There you can see that o shuts down the system. So, if you want to turn off your PC when your Linux crash, you can use this combination:

Ctrl + Alt + PrtSc (SysRq) + reisuo

Restart the computer, in Grub menu choose (recovery mode) and on the next screen select Drop to root shell prompt. Simple as that.

Then he tracked their performance over the next three months.
The introverts fared worst; they earned average revenue of $120 per hour.
The extroverts performed slightly better, pulling in $125 per hour. But neither did nearly as well as a third group: the ambiverts.
In Grant’s study, ambiverts earned average hourly revenues of $155, beating extroverts by a healthy 24 percent.

Who are Ambiverts?

Ambiverts, a term coined by social scientists in the 1920s, are people who are neither extremely introverted nor extremely extroverted. Think back to that 1-to-7 scale that Grant used. Ambiverts aren’t 1s or 2s, but they’re not 6s or 7s either. They’re 3s, 4s and 5s. They’re not quiet, but they’re not loud. They know how to assert themselves, but they’re not pushy.

via washingtonpost.com

Here is one of the first scripts I wrote. It grabs the HTTP Response header. Great thing is that it’s possible to do this with only 7 lines of code.

Script code:

#!/usr/bin/python
import urllib2
import sys
url = raw_input("Full url:")
url.rstrip()
header = urllib2.urlopen(url).info()
print(str(header))

Example usage:

$>python headers.py

$>Full url: http://www.jovicailic.org

As a result, you should get something like:

Date: Wed, 13 Mar 2013 12:35:43 GMT
Server: Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimi
ted/1.4
X-Powered-By: PHP/5.2.9
Vary: Accept-Encoding,Cookie
Cache-Control: max-age=3, must-revalidate
WP-Super-Cache: Served supercache file from PHP
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8

One farmer whose corn always received first prize at the local fair, used to share the best seed with all the villagers around.
When asked why, he said: It’s just a matter of interest. Wind carries pollen from one field to another. If my neighbors would grow low-quality corn, cross-pollination would reduce the quality of my corn. That’s why I always share with others the best seed I have.

The conclusion

Everything we give to others, we give to ourselves.
It is impossible to help others, and not helping ourselves in the same time.
It is also impossible to do harm to others while not doing harm to ourselves.

Step 1

Dad: I want you to marry a girl of my choice.
Son: No!
Dad: The girl is Bill Gates’ daughter.
Son: Then ok!

Step 2 - Dad goes to Bill Gates

Dad: I want your daughter to marry my son.
Bill Gates: No!
Dad: My son is the CEO of the World Bank.
Bill Gates: Then ok!

Step 3 – Dad goes to the President of the World Bank

Dad: Appoint my son as the CEO of your bank.
President: No!
Dad: He is the son-in-law of Bill Gates.
President: Then ok!

If you didn’t see my previous post, for the last 30 days I gave myself a challenge, that I will not go to Facebook, Twitter, and social media in general, that I will minimize mails activities and try to do something more useful.

Well, my challenge was successful. Honestly, I expected it will be.

What can I say now, after this challenge:

• You will not miss anything really important if you’re not on Facebook or Twitter – important news were getting to me in other ways
• You will feel better without so much not-necessary information
• You will have more time for other activities
• You can get Twitter followers without tweeting – for one month without Twitter, I got 19 followers.

I enjoyed time without Facebook/Twitter/Social Media, and in the moments I felt like opening Facebook or Twitter, I would take a book. I started with 100$ Startup. I have read it completely, I am not so satisfied with the book itself, but more about this in other post.

After this one, I started a new book – The Gambler from Fyodor Dostoyevsky. I read this book as well, it’s a great one.

Parallel with this, I decided to take course on Python. I started with Learn Python The Hard Way, and until now, I passed more than half.
Since I “speak” more than few programming languages, learning Python is not something  hard. It’s even pretty easy. So, after I finish the course I mentioned (btw, it’s free! ), I will start with reading a new book on learning Python.

I think that 30-day challenge is a great way to motivate yourself to do things you want to do, to try something you never tried before, etc.
I will for sure give myself next 30-day challenge really soon.

[follow_me]

For the next 30 days, I will not visit Facebook, Twitter and social media in general. Also, I will stop with reading online articles, and I’ll try to minimize my email activities. Instead, I will study and read more books.

Next blog post I will write in 30 days, and tell you about my results.

The challenge starts today at noon ( meaning, in about 40 minutes ).

Two best websites to find free and awesome (or at least good looking) domains are:

• http://www.namemesh.com/
• http://domai.nr/

Check them out.