raspberry pi for dummy: WPA_SUPPLICANT: /SBIN/WPA_SUPPLICANT DAEMON FAILED TO START

Monday, 27 March 2017 UPDATE:
- please refer to this official Raspberry Pi Wifi configuration documentation

After you have the USB Wifi dongle plugged into your RPI, you can scan wifi sign near you with

sudo iwlist wlan0 scan 

command (if this work, that mean you are close to setup wifi successfully)

Finally, if you haven't added any network config in your wpa_supplicant.conf (/etc/wpa_supplicant/wpa_supplicant.conf) insert wifi detail using:

wpa_passphrase "your wifi SSID" "your wifi password" >> /etc/wpa_supplicant/wpa_supplicant.conf

Note: please refer official link attached above for detailed explanation.

---

If you face problems stated below:
- WPA_SUPPLICANT: /SBIN/WPA_SUPPLICANT DAEMON FAILED TO START

You may first look at this Setting up Wifi (EDIMAX) on Raspberry Pi,
if you're still fail to configure a successful connection to your access point (AP or wifi router),

please remove the quote symbol to your psk value like this in your wpa_supplicant.conf:

network={
    ssid="Your SSID Here"
    key_mgmt=WPA-PSK
    psk=YourPresharedKeyHereWithoutQuote
}

get your PSK value from WireShark WPA-PSK Generator.

Once done:
apply commands and restart network or your RPI (sudo reboot):

sudo service networking restart
sudo ifup wlan0 (or sudo ifdown wlan0 then sudo ifup wlan0)

I wrote this because I saw too many tutorial out there didn't mention/emphasize about removing the quote symbol for psk value.
examples

Circled quotes symbols should not be around your psk value

wireless setup command reference: Useful Linux Wireless Commands

Samsung SL i9003: from any custom ROM to Stock ROM 2.3.6

Step 1: Download any of the full package files of the Gingerbread from xdaDevelopers

Step 2: Refer to this video and see how do you place each of the downloaded file in Odin.

Step 3: Download the latest firmware from Samsung and flash it in the easy way by referring to xdaDevelopers

Bootstrap: Automatically add asterisk symbol to detected 'required' form input field

$('input').each(function(){
   if($(this).is('[required=required]')){
    if ($(this).is('[noAsterisk]')){
    return null;
   } else {
       $(this).closest(".YourClassName").children("label").append('<font style="color:red;position:absolute;" > *</font>');
   }
   }
});

* javascript above require jQuery
with the code:

if ($(this).is('[noAsterisk]')){
     return null;
}

allow you to add exception with 'noAsterisk', where you don't require asterisk as there had 'required' html tag appended.

CakePHP: email validation without using model

App::uses('Validation', 'Utility');
class YourClass extends AppController{

public function email($emailInput){
$validEmail = Validation::email($emailInput);
  if(!$validEmail) {
return "error";
}
}

}



Reference Source: http://stackoverflow.com/a/8140790/1834908

Check existing user and group in linux for beginner

I've been checking through the internet to find out a simple command to find out I have what group in my Linux, Fedora:

getent group

so it'll display all the available group with user in return.

to simple return current user's group, simply use:

groups or groups <username>

to display a user's group.

User link to refer: 

Linux: Show The Groups a User Is In
UNIX / Linux Command To Check Existing Groups and Users