The sed does the filtering, you should be able to see how to adapt this to your own requirements
So I want to duplicate init.php while changing the value of a flag inside it for each copy
cat init.php | sed s/flag=2/flag=3/ > dir3/init.php
cat init.php | sed s/flag=2/flag=4/ > dir4/init.php
If you see the first comment Bawdo suggests rightly that this is a UUOC
sed “s/flag=2/flag=4/” init.php > dir4/init.php
I’ve always underused sed unfortunately
which then can written (zsh)
for i in {3,4}; sed s/flag=2/flag=$i/ init.php > dir$i/init.php
sed stands for stream editor and therefore cannot do an in place edit this is where perl thrives
perl -p -i -e ‘s/\surname\b/form_surname/g’ *.php
or safer
perl -p -i.bak -e ‘s/\b23\b/34/g’ fred.php (creates a backup of each file eg fred.bak)
Today I had to update a 12 year old Higgledy-piggledy Microsoft Access Database application to work with the year 2010 instead of 2009 amongst other things . The original designer had needlessly hard-coded the current year’s and previous year’s date anyway I had some notes from when I did it 12 months ago which described what values need changing, but could I find where those values were defined? My notes were not specific enough. The REAL PROBLEM was that last year I must have altered these values without too much of a sweat and so not taken much trouble to note down exactly.
Fortunately I remembered the wonderful stackoverflow.com website. I posed my question and got several useful pointers in a few minutes and these helped me find the solution which was to set the option search whole project.
This is actually a generic problem in life when we realize that we’ve been doing something automatically and been unconscious of how we did it.
My broadband service provider informed me that my network IP address was issuing massive amounts of spam email. To my horror I realised it was my own PC. I’d recently done a lot of work double checking my PC with both Sophus and AVG so I thought I was clean. The Service provider recommended that I use Avast and that I do a DOS Level Search from Boot. The advantage of doing this is that viruses and Trojans have a lot less chance of hiding themselves somewhere in Windows. Well Avast spotted quite a few problems including an iframe Trojan in a back-up of a website but nothing that solved my problem. Well I ran avast several times and then it asked to do another Boot search and then alerted me to a trojan in a driver file micbd.sys c:\windows\System32\drivers\micbd.sys unfortunately the Trojan would not let me delete it from DOS or from Windows whatever, so I used my old trick I booted from a Ubuntu CD this gave me access to the Windows File System and I deleted the offending micbd.sys driver. Now have fought off a couple of Trojans recently I can give you a clue in both cases the first thing I noticed was that the virus checker listed the eventual file as UNOPENABLE
So two tips you may find useful:-
- Use a Ubuntu DVD to rescue, backup, or repair a damaged Windows System (do not install Ubuntu boot from the CD)
- When looking for a Trojan or Virus on your Windows PC be very suspicious that your virus checker marks as inaccessible
<?php
/* create test.xml from following lines
<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<to>Fred</to>
<from>Joe</from>
<heading>Reminder</heading>
<body>Meeting Tomorrow</body>
</note>
*/
error_reporting(E_ALL);
if (!function_exists('simplexml_load_file')) exit('<br>function does not exist');
if (file_exists('test.xml'))
{
$xml = @simplexml_load_file('test.xml');
echo "<pre>";var_dump($xml);
}
else { exit('<br>Error could not locate XML file'); }
?>
LEDs are taking over in the following sectors:-
- LED Flat Screen Televisions are actually LCD TVs which use LEDs for backlighting.
- LED Flashlights or Torches now totally dominate this sector
- LEDs for general lighting
- LEDs for Street Lighting
- LEDs for Traffic Lights
LEDs are taking over because they are incredibly reliable with a life usually easily longer than the expected life of the equipment. They also are more efficient causing less heat dissipation problems. They are very popular for helping to reduce global warming and other Green issues.
Learn more about LED Flashlights here.
The great thing about hereis documents is that in most cases you don't have to backslash quotes, your "html" thus retains its visibility
echo <<<__HTML__
<li><a href=”$pressdir$file”>$file</a>
__HTML__;
$html.= <<<__HTML__
<li><a href=”$pressdir$file”>$file</a>
__HTML__;
return <<<__HTML__
<li><a href=”$pressdir$file”>$file</a>
__HTML__;
it can also cope with arrays if you use the following syntax ${my_array['postcode']}
return <<<__HTML__
<li><a href=”$multimap_url${my_array['postcode']}”>${my_array['postcode']}</a>
__HTML__;
I see so much ugly tangled php/javascript/html/css code which could be tidied up with the PHP Hereis Document
My daughter upgraded her PC from 9.04 to 9.10 independently. Only hiccup it lost the Windows Network Printer however I Googled a bit and found to you needed to upgrade Samba if your Printer was on a Windows 7 PC (our case), so I went to System->Administration->Update Manager. There was a whole bunch of packages in there I selected all of them and did the update. I was then able to Find and Add the Network Printer via the Samba option.
Ubuntu seems to be bathed in clarity and elegance in comparison with Windows even the much vaunted Windows 7. I think this is because Microsoft is a large corporation, I have worked for many years for such organizations where the engineers would find their choices and suggestions overridden by non-technical managers.
Design a Database Driven PHP Page
Many PHP pages turn into a mess because the PHP code is embedded into the HTML and. Over time this gets more and more tangled as the requirements change.
What is required is to make all the necessary database queries and all the manipulation of the data BEFORE you reach the first tag.
All that should appear in the HTML are the various php echos to output the dynamic parts of the page.
So here is the structure of a PHP page
|
query database
|
|
insert data from queries into php arrays (hashs)
|
|
General functions
|
|
Main section call functions, which manipulate the data to get that required by the dynamic web page
|
|
html section
|
When I first got involved with the Internet in 1994 I bought a Best Selling 500 page book on the Internet which only had a passing reference to the WWW mentioning that it might become important. The book concentrated on Gopher (the primitive precursor of the WWW), WAIS which never happened, and the usual Email, USENET and FTP.
But how many Internet users of today have even heard of Gopher!
To allow Ubuntu or Linux PC to Print to a Windows Printer, you must enable LPD on Vista , and Unix Print services on XP.
How to Enable LPD on Vista :-
Control-Panel-> Program and Features -> Turn Windows Features On and Off -> Print Services -> LPD Print Services (Click to Enable)
This done Ubuntu will be able to see your Printer on the Network.
LPD is short for line printer daemon