Galaxy Note 2 battery drain after Android 4.3 upgrade

My Galaxy Note 2 was recently upgraded to JB 4.3 from a very old JB 4.1. To my horror, I saw my battery was draining like crazy and charger can not keep up with the drain when wifi is on. Initially I thought it is misbehaving app perhaps and therefor did a factory reset. That did not solve the problem. Went back to google and found out there may be a solution by enabling "developer mode". To achieve this small feat you need to click on your device properties and tap on 10 times (you read that right, so intuitive) on base band information. After that, everything seems normal now.

Post by Missing Malaysia Airlines MAS Flight MH370.

Ref- http://www.ramil.pro/2013/01/bash.html

1) If condition

There are 3 options:

1) if..then..else..fi

2) [ condition ] && ( expression-if-true ) || ( expression-if-false )

3) test condition && expression-if-true || expression-if-false

2)  Loops

1) Standard for..in

for arg in list;
do
 commands
done

2) C-like for (attention! double brackets!)

for (( i=1; i <= 10; i++ ));
do
 commands
done

3) While loop

while [ condition ];
do
 commands
done

or 

while (( C-like condition ));
do
 commands
done

4) Until loop

until [ condition ];
do
 commands
done

break [N] - exit the loop
continue [N] - start over

Example:

for (( j=0; j<3 -gt="" arr="" code="" do="" done="" fi="" for="" i="" if="" j="" then="" tmp="">

3) Functions

function function_name {
 commands
}

or

function_name() {
 commands
}

exit and return just work as usually

4) Arrays

declare -a array - declare the array first

define value:
a[13] = "foo"

retrieve value:
${a[13]} - only this way!

5) Strings

String length:
str="string"
len=${#str}

Substring:
${str:pos}
${str:pos:len}

Remove part of string:
${str#substring} - remove the shortest part from the beginning
${str##substring} - remove the longest part from the beginning

${str%substring} - remove the shortest part from the end
${str%%substring} - remove the shortest part from the end

Replacement:
${str#substring/replacement} - from the beginning
${str%substring/replacement} - from the end

6) case..in..esac 

case $variable in
condition 1)
 actions
;;
condition 2)
 actions
;;
esac

7) I/O

Read the input:
read -p "Input string: " str
echo $str

8) Features

$@ - arguments array
$1, $2, $n - arguments in order
$0 - program (self) name
$# - arguments number
$* - all arguments as one sting
$_ - last argument of the last command
$? - previous command return code
$$ - own PID
$! - PID of the last background process
!! - previous command as a string
(( a += 1 )) - double brackets let us code like C

$RANDOM - returns a pseudorandom value within 0..32767

declare -r constant - declare as read-only
declare -a - declare as array
declare -i - declare as integer