dragffy.com

You can use cURL for normal copies, but it will also resume interrupted transfers:
curl -C - -O file:///foo/bar.dat

Came accross the following post at:
http://www.pluralsight.com/community/blogs/fritz/archive/2007/06/19/47771.aspx

“I spent more time than I care to admit tracking down this one, perhaps this post will save someone else the trouble…

When defining a number of functions in a prototype in JavaScript, do not include a trailing comma after the last function:

MyType.prototype = {
    foo : function() {
          // ...
    },

    bar : function() {
        //...
    }, //< - fails in IE!
 }

What was especially tricky about tracking this problem down was that FireFox works with or without the trailing comma, so it only fails in IE!"

I have a first generation macbook coreduo.

The latest version of Ubuntu (Hardy Heron 8.04 LTS) works very well on it with minimal configuration. However, several issues remain. One of which is the poor sound quality. Initially, installing linux-backports-modules did the trick, however after several reboots it became clear that it didn’t always work. I came across this post, which I followed and the results were outstanding. I have completely copied it here, only to make sure there is another copy of this important document. Full credit for this one goes to the original author. Anyway, here’s what you need to do:

Edit the file /etc/modprobe.d/options
$ sudo vim /etc/modprobe.d/options

And add the following to the end of the file:
options snd-hda-intel model=[MODEL_BELOW] position_fix=2 probe_mask=1

Run the following command:
$ sudo update-initramfs -u

Then reboot.

You must select the Intel HDA model that corresponds to your computer:

These are the codes you can use in the above instructions:
intel-mac-v1 : Intel Mac Type 1
intel-mac-v2 : Intel Mac Type 2
intel-mac-v3 : Intel Mac Type 3
intel-mac-v4 : Intel Mac Type 4
intel-mac-v5 : Intel Mac Type 5
macmini : Intel Mac Mini (equivalent with type 3)
macbook : Intel Mac Book (eq. type 5)
macbook-pro-v1 : Intel Mac Book Pro 1st generation (eq. type 3)
macbook-pro : Intel Mac Book Pro 2nd generation (eq. type 3)
imac-intel : Intel iMac (eq. type 2)
imac-intel-20 : Intel iMac (newer version) (eq. type 3)

For example, I have a Macbook 1st generation, and the only setting that worked was
model=intel-mac-v1. All others just gave me no sound at all, including the apparently
obvious macbook and the documented-as-equivalent macmini ones.

If nothing works, you can revert this by deleting the line and performing the rest of the steps.

For BEST sound, if the above works, open a terminal and type:
$ alsamixer

And set the front and surround sliders to their maximum.
It might be necessary to unmute them with the ‘M’ key.
Press ESC twice to leave the program.

I recently set up a new file server. It contains three 1 terabyte drives configured in a RAID 5 array but with RAID 1 for the boot partitions so in the event of drive failure the system could still boot.

Essentially you need to go through a normal installation process and make sure you choose a couple of things during parition setup. I split each of the 3 drives in to two partitions, one 200MB, and the other partition the remaining disc space. This is what I had:
sda1 = 200MB
sda2 = 9800MB
and the same for the other drives.

Set all sda1 partition to be ext3 and bootable and mounted as /boot, set sdb1 and sdc1 partitions to be Linux Software Raid, bootable, but not mounted. Configure the RAID and create a new RAID device, tell it to use three devices and add to it sda2, sdb2, and sdc2.

When I returned to the partition menu I configured md0 as a partition for a logical volume group. I then configured LVM and created logical volumes for /root, swap, and /home. Returning to the partitioning menu I formatted these and selected their mount points and installed the system.

Following system installation I went about creating a RAID 1 array for sda1, sdb1, and sdc1. First thing was to create a new array using mdadm and the two paritions we haven’t yet assigned:
# mdadm --create /dev/md1 --level=1 --raid-disks=3 missing /dev/sdb1 /dev/sdc1

Make a filesystem on our new RAID device:
# mkfs.ext3 -m 0 /dev/md1

Save the new configuration in to mdadm’s config file:
# mdadm --examine --scan >> /etc/mdadm/mdadm.conf

Edit mdadm.conf and remove the duplicate entry at the bottom:
# vim /etc/mdadm.conf

Mount the new RAID device so we can copy data to it:
# mkdir /media/md1
# mount /dev/md1 /media/md1

Copy over the boot partition to the RAID device:
# cd /boot
# cp -dpRx . /media/md1

Edit fstab and replace /dev/sda1 with /dev/md1:
# vim /etc/fstab

Edit mtab and do the same:
# vim /etc/mtab

Unmount /boot, change it’s system type and add it to the RAID array:
# umount /boot
# fdisk /dev/sda
Command (m for help): t
Partition number (1-4): 1
Hex code (type L to list codes): f
Changed system type of partition 1 to fd (Linux raid autodetect)
Command (m for help): w

# mdadm --add /dev/md1 /dev/sda1

Configure GRUB so that it can boot from any hard drive:
# grub
grub> device (hd0) /dev/sda
grub> root (hd0,0)
grub> setup (hd0)
grub> device (hd0) /dev/sdb
grub> root (hd0,0)
grub> setup (hd0)
grub> device (hd0) /dev/sdc
grub> root (hd0,0)
grub> setup (hd0)
grub> quit

# update-initramfs -u

Change all occurance of (hd*) to (hd0) in the file /boot/grub/devices.map.

That should be all – good luck with the reboot!
# reboot

Installing Netatalk from the repositories means that when you connect using a Mac client you will be warned that you are going to send your password in the clear. Obviously this isn’t great for security, and being prompted every time you want to connect is annoying. This occurs because Netatalk in the Ubuntu repositories is compiled without SSL support (SSL is what handles the encryption).

The key to getting this to work is to get the Netatalk source code and compile it yourself. Don’t worry, it’s been done hundreds of times before and if you follow this tutorial closely you should be fine.

The commands written always start with a dollar sign ($), you should not type this, it just indicates the commands should be typed at a standard user prompt in the terminal.

First off it’s a good idea to switch to your home directory:
$ cd ~

Make a new directory to hold the hundreds of small Netatalk files:
$ mkdir netatalk

Ensure you have essential development libraries and tools installed:
$ sudo aptitude install libdb4.2-dev libslp-dev autotools-dev devscripts cracklib2-dev dpkg-dev libssl-dev

Change in to the newly created directory:
$ cd netatalk

Install the netatalk source code:
$ sudo apt-get source netatalk

Install all required dependencies for netatalk:
$ sudo apt-get build-dep netatalk

A new directory called netatalk-2.0.3 should have been created, change in to that directory:
$ cd netatalk-2.0.3

Compile Netatalk with the SSL option:
$ DEB_BUILD_OPTIONS=ssl sudo dpkg-buildpackage -us -uc

Install the finished product!:
$ sudo debi

Initially I had set a mail account with a quota of 200000, or roughly 200MB. The user complained of a full mailbox, despite using Plesk to up the limit to 2GB, and then unlimited the account continued to bounce emails saying:
"Recipient's mailbox is full"

I found people complaining of a bug in version 7.5 of Plesk, but it seems this is also present in 8.3. The problem, I discovered after nosing around the config files of the server, was that any changes I made in Plesk weren’t saved. Ultimately I found the limit in the config file remained at 200MB, despite numerous changes. The quota config file is located at:
/var/qmail/mailnames/example.com/username/@mbox.quota

Manually edit that file so it has the quota you want. I like to use vim:
vim /var/qmail/mailnames/example.com/username/\@mbox.quota
(run this as root)

After editing, save the changes, and you won’t need to restart any services or the server. Changes should take effect.

Note, that this was performed on a CentOS 5 installation, so paths and instructions may vary slightly on other systems.

Profiling an application is a great way to see how it is performing. CodeIgniter comes with a profiling class, which you can make calls to from your controllers. However, during development I find profiling so helpful that I want it on all my pages, without having to specifically call it each time. I also want to be able to deploy my development site to a production server – making calls to the profiler throughout the controllers means I would need to edit each and every controller to make sure the profiler wasn’t active on the live server.

After much searching I discovered a better solution. This allows you to add profiling to the bottom of every page (along with its debug info and SQL query info). When you copy the dev site live you just exclude 1 file, and profiling will be removed totally. All you need to do is create a file called MY_Output.php in system/application/libraries that extends the Output core class, with the following contents:

< ?php
# /system/application/libraries/MY_Output.php
if (!defined('BASEPATH')) exit('No direct script access allowed');
class MY_Output extends CI_Output {
function __construct() {
parent::__construct();
$this->enable_profiler( TRUE );
}
}
?>


This will enable profiling output on all your pages for development and debug purposes. When you copy your site to a production server just make sure you don’t copy MY_Output.php file. I normally use rsync for copying live and just add: --exclude="MY_Output.php" to the rsync command.

The condition to using the name MY_Output.php is that you left the variable $config['subclass_prefix'] in config.php as default. This defaults to $config['subclass_prefix'] = 'MY_';, so if you change it you will need to alter the filename of your new class.

dscacheutil -flushcache

In the “about:config” section of Thunderbird (Tools > Options > Advanced > Config Editor) look for the “mail.imap.fetch_by_chunks” and ” mail.server.default.fetch_by_chunks” values and set them to “False”.

Mozillazine gives some more information about what this value actually does here

find . -iname "*.jpg" -print0|xargs -0 -I {} convert -quality 60 -resize 461x317 {} {}