Counting Table Columns 
SELECT COUNT(*)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_schema = 'database_name'
AND table_name = 'table_name'

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Adding DNS Servers in CentoOS 
!!!!CentOS 6.4 !!!!

//the following command overwrites /etc/resolv.conf (or when rebooting)
service network restart
//instead, add the following to /etc/sysconfig/network-scripts/ifcfg-eth0
DNS1=4.2.2.2
DNS2=4.2.2.1

!!!!!!!!!!!!!!!!!!!


//open this file
vim /etc/resolv.conf

//add entries
nameserver 4.2.2.2
nameserver 4.2.2.1

//test
nslookup barney.com

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How to configure network interfaces in CentOS (static ip) 
//edit interface configuration file
sudo vim /etc/sysconfig/network-scripts/ifcfg-eth0

//set settings
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:05:29:E0:4F:3D
IPADDR=10.0.1.10
NETMASK=255.255.255.0
GATEWAY=10.0.1.1
DNS1=4.2.2.2
DNS2=4.2.2.1
ONBOOT=yes
TYPE=Ethernet


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IPTABLES common tasks 
//list rules
iptables -L --line-numbers
iptables --list

//inserting rules
iptables -I INPUT -p tcp --dport 80 -j ACCEPT //inserts a rule on top
iptables -I INPUT 5 -p tcp --dport 21 -j ACCEPT //inserts a rule on the 5th position

//deleting rules by line number
iptables -D INPUT 5 //deletes the 5th rule

//saving rules
service iptables save //centos



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Set a PHP Cookie to expire at midnight 
//You might find strtotime useful in these situations.

setcookie('cons', 1, strtotime('today 23:59'), '/');


http://stackoverflow.com/questions/1313 ... t-midnight

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Gnome Terminal 2.16.0 Basic Tasks 
//Open a new tab
ctrl+shift+T

//Switching tabs
ctrl+pageUp

//Also: Switching consoles in linux:
ctrl+alt+F1
ctrl+alt+F2
ctrl+alt+F3
ctrl+alt+F4
ctrl+alt+F5
ctrl+alt+F6
ctrl+alt+F7


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Simple cURL example in PHP 
<?php

/*
We'll get the content of a remote page to display locally ;)
*/

$curl=curl_init();
// Set some options - we are passing in a useragent too here
curl_setopt_array($curl, array(
CURLOPT_RETURNTRANSFER => 1,
CURLOPT_URL => 'http://www.televisa.com/us/',
CURLOPT_BINARYTRANSFER=>true,
));

// Send the request & save response to $resp
$resp = curl_exec($curl);

// Close request to clear up some resources
curl_close($curl);

echo $resp;

?>

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Selecting Random Rows in MySQL 
SELECT * FROM tablename
WHERE somefield='something'
ORDER BY RAND() LIMIT 5


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Populating a Table from another Table 
INSERT INTO NewTable (col1, col2, col3) SELECT col1, col2, col3 FROM OldTable

Page 985 in MySQL Developer's Library (Paul DuBois), and
http://stackoverflow.com/questions/3140 ... to-another

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How to part DATE and TIME from DATETIME field type in MySQL? 
//Use the following query:
SELECT DATE(`date_time_field`) AS date_part, TIME(`date_time_field`) AS time_part FROM `your_table`;

//Also you can use:
SELECT DATE_FORMAT(colName,'%Y-%m-%d') DATEONLY,DATE_FORMAT(colName,'%H:%i:%s') TIMEONLY FROM `your_table`;

http://stackoverflow.com/questions/1233 ... e-in-mysql

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