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Removing the fold columns on the left gvim after using diffsplit

One thing that I find annoying in gvim is the foldcolumn parameter which is not reset once you are done with a diff process.

Of course, gVIM does not really know when you are done diff-ing, so its behavior makes sense... only it is still annoying.

To remove the fold (2 gray columns on the left used to hide areas that match in each file) you simply have to set the foldcolumn parameter to zero:

:set foldcolumn=0

Just in case, you enter a diff from within vim by loading two files, then using;

:diffsplit #

The diffsplit can specify any buffer number, I use the # as the other buffer (the ...

HTML background that fits the screen

You can actually define an image or a background (with CSS) that fits the area in which is it shown.

For a simple image use a width of 100%, then the browser computes the height for you.

  <div class="header"><img src="images/background.png" width="100%"></div>

This code will make the image width match the width of the <div> tag. Assuming the <div> tag fits the screen width, it will show in the full width, stretching as required.

When trying to do that with a background image in CSS, you want to use the background-size parameter ...

Useful online network tools

I'm starting this page and hope to think about it again at a later time when I find additional tools... but as I have network problems I often need these types of services to make sure I can get the information I need.

For more Network stuff, click on the Network tag!

What is your IP address?

Check your current IP address from your browser: [Super clean version!] [More advance and with ads...]

What is my DNS?

This one is for people who setup a DNS to make sure that it can accessed from all over the world. It ...

Forbidden -- client denied by server configuration

Working on a PHP application setup, I stumble upon a problem. Going to the installation page, I got the dreadful error:


You don't have permission to access <root-path>/admin/install on this server.

Looking at the error logs, the only thing reported was:

client denied by server configuration

The fact is that Apache does not tell you which setting actually forbids the access. I guess that's because once it gets checked by Apache, it is a blend of all the settings and not a tree being followed.

Looking a round, and since I already had that error not too long ...

Apache log says: client denied by server configuration

I work with Apache a lot. It is a really good web server that has many options and features. Unfortunately, maybe it has too many of them!

I ran in a problem where a notification from one server to another would fail with the following error:

[Fri Oct 11 19:43:50 2013] [error] [client] client denied by server configuration: <path to file>

Looking at the error, I was first thinking that my script was generating the error. The fact is that my script does not generate error 403. It has a 400 and 500 but not 403.

So looking at the error I thought, maybe that's an ...

tripwire while updating the policy settings: Error: Policy Update Changed Object.

As I was trying to remove some annoying entries in my Tripwire policy, I started getting errors. The first time I did not pay close attention, but the next day the policy had not changed! So I looked at it closer and noticed that if a file changed since the last update, then tripwire refuses to update the policy. That is, if the secure mode is set to high.

So to update my tripwire policy I was running:

sudo tripwire -m p -p /etc/tripwire/tw.pol --secure-mode low /etc/tripwire/twpol.txt

which now (at least since 13.04, maybe in 12.10?) means the secure mode is left alone and is marked as ...

Sep 27 00:58:42 halk postfix/error[16751]: 628254C02F0: to=<>, relay=none, delay=1.8, delays=0.06/1.6/0/0.14, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to[]:25: Connection timed out)

My syslog was filled up with errors such as this one:

    Sep 27 00:58:42 halk postfix/error[16751]: 628254C02F0: to=<>,
    relay=none, delay=1.8, delays=0.06/1.6/0/0.14, dsn=4.4.1, status=deferred
    (delivery temporarily suspended: connect to[]:25:
    Connection timed out)

I've been wordering for a while, since I can use Thunderbird with a direct connection to my server, I was not too concerned, but tonight I really needed to support those emails because I have work to do that requires it.

Got NVG510 to setup?
Hacking my ...

Ubuntu 12.04 to 12.10

I just upgraded from 12.04 to 12.10 and my desktop was fully reset to the defaults. Rather annoying.

The worst part is that I tried to do things such as reassigning the Alt-F1 and Alt-F2 keys and it did not work. Somehow the default Gnome keys remained in effect!

I found the solution on Ask Ubuntu.

gsettings set org.gnome.desktop.wm.keybindings panel-main-menu "[]" # disable Alt+F1
gsettings set org.gnome.desktop.wm.keybindings panel-run-dialog "[]" # disable Alt-F2

Editing the preferences did not work at all.

Source: ...

Copy files between a guest (virtualbox) and the host

I use VirtualBox and had a problem with copying files between my host (main computer on which you boot your computer) and the guests (virtual computer that you run on your host).

The fact is that it is all explained right here:

There are a few steps as follow.

Install the Virtual Box Tools

Install the Virtual Box Tools (called Guest Additions) on your guest; these tools allow your guest to communicate with the host to allow files to be written in a directory on the host.

To install those, it should be as easy as using the ...

Copying a PostgreSQL database from one computer to another

When moving a database from one computer to another, you've got to copy all the data.

For PostgreSQL, there is a pair of functions named pg_dump and pg_restore.

In most cases that works great, however, some systems may create things such as additional functions that will NOT make it across. I do not know how to get that to work (and maybe it works in newer version of PostgreSQL?)

In any event, in most cases the following commands are enough (I used them with Drupal websites and since they stopped using some of the definitions they have in the system.install file used on initialization, ...

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    Name of a Walt Disney character used for a version of Ubuntu.

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    nop is the usual abbreviation for the No Operation command often used in assembly language (processor code.) Some times, it is written as noop instead.

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