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Useful VIM Abbreviations for Debugging Perl

March 5th, 2010 No comments
iab perlb print “<p>debug ::: $_ :: $’ :: $` line “.__LINE__.”\n”;exit;
iab perlbb print “<p>debug ::: <C-R>a line “.__LINE__.”\n”;exit;
iab perlbd do{print “<p>debug :: <C-R>a line “.__LINE__.”\n”;exit} if $_ =~ /\w\w/i;
iab perld use Data::Dumper; print Dumper %ENV;

the <C-R>a automatically inserts whatever variable you had previously stored in register a

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Copying all but today’s files

February 25th, 2010 No comments

I’d put some new files into a folder before remembering to mothball all the old files:-

Here is a zsh solution:-

>mv *.*(^m-1)   ./old

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Viewing Remembered Password in Firefox

January 18th, 2010 No comments

You know the frustration of being able to log into a website because your browser has
remembered the password but you have forgotten it and so cannot login from another pc.
Well FireFox will show them to you

options->security->Saved Passwords then click Show Passwords

You may want to consider the security implications as well, to disable this feature while
retaining the ability of the browser to remember passwords

go to

options->security-set master password

I personally never let a browser remember say my PayPal password

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copy a file while modifying a value inside it

January 14th, 2010 1 comment

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)

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Forgetting How You Solved a Problem the First Time

January 13th, 2010 No comments

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.

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PHP : Read XML File with simplexml_load_file Test Script

December 16th, 2009 No comments


<?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'); }
?>

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LED Lighting Taking Over the World

December 13th, 2009 No comments

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.

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zzapper’s Technical Tips

July 16th, 2008 No comments

Vim Tips and Tricks Famous Vim Tips
Vim Tips Blog Vim Tips in Detail
zsh tips An Alternative to bash
ZSH Daily Twitter Tip AZSH on Twitter
Cygwin tips Linux on your Windows PC
Best Productivity Programs Open Source
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