L.A.M.N.K » Computer

Remove the black Google bar with Greasemonkey script

Lamnk — Thu, 17 Nov 2011 17:18:19 +0000

If you use Google Docs in Chrome’s or Firefox’s app mode, you will see instantly how disturbing the new black Google bar is. It’s very intrusive:

You can use this script to remove the black bar. However this script works on all Google’s websites. Sometimes it’s useful to have direct links to Google Mail, Images, News or Pictures so those sites are only one click away. But when you are in app mode, you’ll want to focus to your document only. In Firefox you can change the affected sites in Greasemonkey’s settings. However because Chrome installs user’s scripts directly, you must edit the script and replace the wildcard regex with https://docs.google.*/*

The result:

How to fix error 1601 1604 when unlock iPhone with Winpwn

Fixing Ubuntu 11.10 Oneiric Ocelot wireless problem with Atheros AR9285 and Ralink RT3090

Lamnk — Mon, 31 Oct 2011 15:15:28 +0000

If your laptop has either Atheros AR9285 or Ralink RT3090 wireless adapter, then Ubuntu 11.10 shows that driver is properly loaded, wlan0 interface is up, however you can not enable wireless in NetworkManager. Wireless is turned off instantly after you click on “Enable Wireless” or after manually bringing the interface up.

The solution is to blacklist the acer-wmi module: open the file /etc/modprobe.d/blacklist.conf and add this line:

blacklist acer-wmi

Then reboot.

Note: in Archlinux the module is named acer_wmi

Optimize WordPress for speed

Lamnk — Sun, 28 Nov 2010 00:34:38 +0000

I confess, I’m a speed freak, premature optimization type

Still not that good with Google’s PageSpeed, i’ll fix those warnings soon (most of them, however, is from external hosts)

The essential plugins are:

WP-Super-Cache: this one is trivial. Every WordPress blog should have this plugin enabled by default.
Use Google Libraries: replace WordPress included javascript libraries with copies hosted on Google’s servers.
WP-Minify: minify your files (HTML, CSS) then concatenate CSS files into one file. Javascript files served by Use Google Libraries are external and minified already.

combining with some tweaks in my WordPress theme and nginx.conf

Remember to specify nginx’s temp directory path

Lamnk — Sun, 21 Nov 2010 16:54:13 +0000

I catched this error in my log:

2010/11/20 12:38:22 [crit] 792#0: *58342 open() “/usr/local/fastcgi_temp/2/23/0000002309″ failed (13: Permission denied) while reading upstream, client: XXX.XXX.XXX.XXX, server: xxx.host.com, request: “GET /page.php”, upstream: “http://0.0.0.0/dir/page.php”, host: “lamnk.com”, referrer: “http://referrer.com/”

fastcgi_temp should in no way belong to /usr/local. It’s clear that if you forget to set configuration flags, nginx will set the path to prefix‘s path during compilation. Run ./configure --help show:

% ./configure --help | grep -e "temp-path" --http-client-body-temp-path=PATH set path to the http client request body --http-proxy-temp-path=PATH set path to the http proxy temporary files --http-fastcgi-temp-path=PATH set path to the http fastcgi temporary --http-uwsgi-temp-path=PATH set path to the http uwsgi temporary files --http-scgi-temp-path=PATH set path to the http scgi temporary files

On my system they go to /var/tmp/nginx according to CentOS file system structure.

Fix Nginx 411 Length Required error

Lamnk — Sun, 21 Nov 2010 02:49:16 +0000

If you don’t want to read my rant below: use HttpChunkinModule

In my case i used a Readbility API to parse news articles’ content. The API receives requests and POST it back to URL specified in the request.

However no matter how hard i tried, the API’s log always told me there was error. I POST’ed many requests manually to test it myself; my server received and processed all of them, but not the API’s ?

So I turned on unicorn‘s log to see what’s wrong. Well, there was absolutely no hit from any IP except from my computer. Strange, it means API’s requests must be blocked from higher (lower?) level, either nginx or iptables. Firewall is unlikely the cause since it’s normal HTTP, it must be nginx:

129.206.*.* - - [20/Nov/2010:15:37:08 -0800] "POST / HTTP/1.1" 200 106 "-" "Ruby" "-" 77.234.*.* - - [20/Nov/2010:15:37:45 -0800] "POST / HTTP/1.1" 411 174 "-" "-" "-"

Aha, here you are. But why the hell nginx returned error code 411 ? According to Sysoev, author of nginx, there may be 3 reasons for 411 error if you use POST or PUT method to send requests to nginx:

client sent invalid “Content-Length” header
client sent … method without “Content-Length” header
client sent “Transfer-Encoding: chunked” header
The last reason is nginx feature: it still does not support chunked body.

Oh, it’s not a bug, it’s a feature ! I couldn’t stop swearing, this “feature” takes me almost one day to find out. And Google shows a lot people who are like me.

nginx’s error log (you must turn debug on):

2010/11/20 18:19:05 [info] 16755#0: *80135 client sent "Transfer-Encoding: chunked" header while reading client request headers, client: 77.234.129.43, server: lab.lamnk.com, request: "POST / HTTP/1.1", host: "lab.lamnk.com"

Once you know causes of the problem, then it’s (supposed to be) easy to fix it: recompile nginx with HttpChunkinModule, added configuration directives in nginx.conf and we’re good !

PS: kudos to the guys at Preona for the nice API

Remember to specify nginx’s temp directory path

Fix Cydia crashes

Lamnk — Sun, 14 Nov 2010 18:49:29 +0000

If Cydia quits during an installation process, it could refuse to run next time. Solution: remove everything in:

/var/lib/dpkg/updates/

and every files in

/var/lib/apt/lists/

except the folder called partial. Then reboot your Iphone.

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Replace a string in all files recursively within a directory

Lamnk — Sat, 06 Nov 2010 02:28:30 +0000

Power of NIX:

find /some/dir -type f | xargs sed -i 's|string1|string2|'

Even stronger, replace a string in all files that match a regex:

grep -rlE "^regexhere$" /some/dir | xargs sed -i 's|string1|string2|'

Note that grep uses POSIX regex, not perl-like regex. But i think POSIX regex is sufficient for most cases.

Or you can use rpl (I don’t)

Remember to specify nginx’s temp directory path

Remove GNOME panel

Lamnk — Fri, 22 Oct 2010 02:41:43 +0000

How to remove GNOME panel (it’s not to remove gnome-panel package)

Removing the last panel isn’t possible, and as long as the panel is running as Gnome component it will automatically spawn back if you try to kill it.
So, if you want to remove the Gnome-panel from your desktop you need to start gconf-editor and then remove “panel” from the list in desktop/gnome/session/required_components list (and perhaps also unset the desktop/gnome/session/required_components/panel -key).
But if you are planning to just run some other panel or dock instead it would make sense the leave the panel in the session components, and then just set the desktop/gnome/session/required_components/panel to use whatever program you are planning to run. This would automatically start that app for you and also autospawn it back if it crashes or is killed.
Also note that if you disable Gnome-panel you will loose the Alt-F2 Run dialog as well, so make sure you have some other way to start applications that the Run dialog and panel menus.. If you want similar functionality without running the Gnome-panel Gmrun is a nice app for the purpose, just set Alt-F2 as keyboard shortcut to launch it.

I don’t understand why we aren’t allowed to remove the last panel ? And loose the Run Dialog as consequence ???

Sometimes it’s beyond your imagination

Lamnk — Mon, 17 May 2010 16:49:52 +0000

The sheer stupidity of this registration form is unfathomable. Not only they don’t allow white spaces, they also forbid vietnamese characters ! How can I submit my name now ?!

On the other side, i really give kudos to LacViet for having an usable ecommerce site. They make online transactions quite pleasant to go through (except the atrocity above, of course)

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Interesting Windows hotkeys you should know about

Lamnk — Fri, 26 Mar 2010 15:51:30 +0000

Vim has shown me the power of muscle memory. That’s why i always try to learn hotkeys of any thing i use daily. Managing your desktop environment of course is one of those tasks.

Below are non-trivial and useful windows hotkeys that you probably don’t know about.

Win + Pause = System Properties

Win + D = Show Desktop

Win + M = Minimize all windows

Win + E = Launch Win Explorer (@ My Computer),

Win + R = Run Command

Win + L = Lock the screen

Win + X = Open Windows Mobility Center

Win + T = Shift through windows list in task bar (Win7)

Win + P = Change display output between Computer and Projector

Win + B = Let you select items in task bar’s tray

Ctrl + Esc = Start Menu (for those who use old keyboard)

Ctrl + Shift + Esc = Show Task Manager

Win + Shift + M = Maximize all windows

Alt + Spacebar + X = Maximize window

Alt + Spacebar + N = Minimize window

Alt + Spacebar + R = Restore

Alt + Tab = Shift between Windows (this one is trivial but do you know that Alt + Shift + Tab = Shift between Windows in reverse order ?)

Ctrl+ Shift + F10 = Shows Context Menu (Mouse Right Click Effect)

Application Specific (generally): Ctrl + S = Save, F3/Ctrl + F = Find

Desktop/Win Explorer: F2 = Rename File, F3/Win + S = Launch Search