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set @created_by = null; -- if the var is null, the comparison cant be with '='

select *
from users
where 
	IF(
		@created_by is null, users.created_by is null, -- both var and field are null
		@created_by = users.created_by -- normal comparison, when var is not null
	)
limit 1;

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XVFB=/usr/bin/Xvfb
XVFBARGS=":1 -screen 0 1024x768x24 -ac +extension GLX +render -noreset"
PIDFILE=/var/run/xvfb.pid
case "$1" in
  start)
    echo -n "Starting virtual X frame buffer: Xvfb"
    start-stop-daemon --start --quiet --pidfile $PIDFILE --make-pidfile --background --exec $XVFB -- $XVFBARGS
    echo "."
    ;;
  stop)

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#!/bin/bash 
usage='Usage: ssh-tailf-notify <user@server> <logfile> [grep args]

Easy way to receive desktop notifications based on remote logfile-events or named pipes

examples crontab:

* * * * * nohup /home/you/bin/ssh-tailf-notify [email protected] /home/you/irclogs/fnotify.txt -vE "(foo|bar)" &
* * * * * nohup /home/you/bin/ssh-tailf-notify [email protected] /home/sqz/irclogs/EFnet/#python.log -vE "(mynick)" &
* * * * * nohup /home/you/bin/ssh-tailf-notify [email protected] /var/log/messages "-E (memory|booking)" &

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<?php

namespace Soap\Controller;

use Zend\Mvc\Controller\AbstractActionController;
use Zend\Soap\AutoDiscover as SoapWsdlGenerator;
use Zend\Soap\Server as SoapServer;

class SoapController
{