Karlo Luiten

Use document title and document date in lyx fancyheader

karlo — Tue, 14 Feb 2012 09:37:42 +0000

Put this in your Lyx preamble (document -> settings -> preamble):

\def\title#1{\gdef\@title{#1}\gdef\THETITLE{#1}} \def\date#1{\gdef\@date{#1}\gdef\THEDATE{#1}} \def\author#1{\gdef\@author{#1}\gdef\THEAUTHOR{#1}}


\usepackage{fancyhdr}

\pagestyle{fancy}

\newcommand{\helv}{%

\fontfamily{phv}\fontseries{b}\fontsize{10}{10}\selectfont}

\lhead{\helv \THETITLE - \THEDATE }

\rhead{\helv \THEAUTHOR}
\usepackage{lastpage}

\cfoot{\thepage\ / \pageref{LastPage}}

My tip: a temporary directory (for temporary files)

karlo — Mon, 13 Feb 2012 16:01:51 +0000

My tip: make a temporary directory for all kinds of random stuff. Downloads, quick notes et cetera. I use it a lot. By using a crontab like this, the old files (+5 days) are automatically deleted:

$ find /home/karlo/temp/ -type f -mtime +5 -delete && find /home/karlo/temp/ -empty -delete

Import mp3 in audacity (on fedora)

karlo — Wed, 08 Feb 2012 13:05:43 +0000

Remove audacity (#yum remove audacity), install audacity-freeworld (#yum install audacity-freeworld ). That’s it. You might have to enable RPMFusion.

Encrypt Dropbox content easily on Linux/BSD/OSX using encfs

karlo — Tue, 24 Jan 2012 21:46:01 +0000

Install encfs
do $mkdir ~/Dropbox/Secure ; mkdir ~/DropboxSecure
do $ encfs ~/Dropbox/Secure ~/DropboxSecure
I chose paranoia mode. This will use the settings below.
Enter a secure password and there you go.

You now have a folder ‘DropboxSecure’, in which you can store your sensitive data. It will save this in ~/Dropbox/Secure/ .

You can unmount this via $ sudo umount /home/karlo/DropboxSecure #needs to be done using sudo. I guess this is a bug. After umounting, you will notice the directory DropboxSecure is still there, but empty.

Mount again by using step 3 and entering your password.

Paranoia settings:

Filesystem cipher: “ssl/aes”, version 3:0:2
Filename encoding: “nameio/block”, version 3:0:1
Key Size: 256 bits
Block Size: 1024 bytes, including 8 byte MAC header
Each file contains 8 byte header with unique IV data.
Filenames encoded using IV chaining mode.
File data IV is chained to filename IV.
File holes passed through to ciphertext.

Screenshot:

Sleep better by installing one simple program

karlo — Sun, 22 Jan 2012 15:54:53 +0000

Redshift adjusts the color temperature according to the position of the sun. A different color temperature is set during night and daytime. During twilight and early morning, the color temperature transitions smoothly from night to daytime temperature to allow your eyes to slowly adapt. At night the color temperature should be set to match the lamps in your room. This is typically a low temperature at around 3000K-4000K (default is 3700K). During the day, the color temperature should match the light from outside, typically around 5500K-6500K (default is 5500K). The light has a higher temperature on an overcast day.

It works very good. I use it like this:

$ redshift -l 52.369:4.891 #amsterdam

http://www.openstreetmap.nl/ can give you your coordinates.

Easily setting up a ThePirateBay.org mirror (wordpress plugin)

karlo — Thu, 19 Jan 2012 13:47:25 +0000

Easier than my previous post, use this plugin for wordpress.

Easily setting up a ThePirateBay.org mirror (nph-tpb.cgi)

karlo — Wed, 18 Jan 2012 08:58:30 +0000

If you want to set up a simple pirate-bay mirror, download this script. This is the nph-tpb.cgi – file various sites talk about. Setting up is easy. It is just a CGI script. So place it in your CHI-folder (or create one) and set the directory-settings so it will allow CGI scripts. Sample config is in [...]

Example postfix + dovecot SSL configuration

karlo — Sat, 14 Jan 2012 15:02:35 +0000

I generated SSL certs using this guide. Then I set up dovecot and postfix. View my dovecot conf here and my psotfix main.cf here.

You can use this to configure your own working SSL mail. Remember to install: dovecot, dovecot-imap and postfix.

On your devices, use ports 143/993 (incomping) and 587 (outgoing).

Please note my main.cf file also includes config for mailman.

[Solution] Can’t use /usr/lib/dovecot/imap: No such file or directory

karlo — Sat, 14 Jan 2012 14:17:39 +0000

Getting this?

$ sudo service dovecot restart
* Restarting IMAP/POP3 mail server dovecot
Error: mail_executable: Can’t use /usr/lib/dovecot/imap: No such file or directory
Fatal: Invalid configuration in /etc/dovecot/dovecot.conf
…fail!

install dovecot-imap

Update wordpress without needing FTP

karlo — Sat, 14 Jan 2012 10:27:19 +0000

Give your wordpress dir the right permissions: sudo chmod -R 775 wp-dir ; sudo chown -R username:www-data
Add this in wp-config.php: define(‘FS_METHOD’,'direct’);

You can now update via ‘update now’.

Test SMTP block (sshguard, fail2ban)

karlo — Wed, 11 Jan 2012 14:39:38 +0000

I used the following script to test brute-force protection:

#!/usr/bin/php

for( $i=0; $i<99; $i++ ){
echo “Will try [$i] now. \n”;
$mbox = imap_open(“{mail.mailserver.com:143/imap/novalidate-cert}INBOX”,”user_test_$i”,”foobar”,0,0);
}

Edit: You will need php-cli and php-imap

Deprecated Linux networking commands and their replacements

karlo — Thu, 29 Dec 2011 21:26:10 +0000

Found this gem on an other blog:

Deprecated Linux networking commands and their replacements

I mostly use $ifconfig. Let’s try `$ ip a` from now on .

[Solution] GConf Error – GetDefaultDatabase – org.gnome.GConf.Server

karlo — Thu, 29 Dec 2011 10:23:05 +0000

Recently I got the error:

GConf Error: Configuration server couldn’t be contacted: D-BUS error: Method ” GetDefaultDatabase” with signature “” on interface “org.gnome.GConf.Server” doesn’t exist.

I got this while trying to start Evolution (mail software).

Solution is simply rebooting. I forgot to reboot after my Fedora 15 to Fedora 16 upgrade

[Solution] Jar not working via command line

karlo — Tue, 20 Dec 2011 12:41:51 +0000

Getting this:

$ java drs.jar
Exception in thread “main” java.lang.NoClassDefFoundError: drs/jar
Caused by: java.lang.ClassNotFoundException: drs.jar
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: drs.jar. Program will exit.

Solution is:

$java -jar drs.jar

Clear BASH history

karlo — Mon, 19 Dec 2011 19:54:04 +0000

Clear the BASH history easily via:

$ >~/.bash_history

Remember to log out after doing this.

ifconfig gone (command not found)

karlo — Sun, 18 Dec 2011 18:39:05 +0000

Today, ifconfig was not working for me. I think this happened after I installed X11 on my headless server.

$ ifconfig
bash: ifconfig: command not found

It turns out something removed /sbin from my $PATH. Read more about the $PATH here.

The ifconfig-command resides in /sbin:

$ whereis ifconfig
ifconfig: /sbin/ifconfig

The solution is to put something like this in your .bashrc:

PATH=$PATH:/sbin
export PATH

Use $top over SSH

karlo — Sun, 18 Dec 2011 18:31:22 +0000

If you want to use `top` over SSH, use the -t option:

$ ssh -t servername top

This also works if you want to use `tail -f` over ssh:

$ ssh -t servername “tail -f”

My idea for this site

karlo — Sun, 18 Dec 2011 18:19:34 +0000

My idea on this site is to put snippets of codes / solutions / things I discovered here. When people will google a sulution to their problem, I hope they find it here.

Or, if I search for the same problem again, I’ll find the answer here.