x-haui

Here are 2 ways, to determine your public IP address using curl, sed and grep. I recommend using the second one.

curl -s www.wieistmeineip.de | grep class=\"ip\" | sed -r 's#(.*>)(.*)(<.*)#\2#'
curl -s checkip.dyndns.org | sed -r 's#(.*: )([0-9.]*)(<.*)#\2#'

Most perl scripts I write start like this:

#!/usr/bin/perl
use strict;
use warnings;
#maybe the GPL or some other stuff...

Additionally it's always required to set the "x flag" via chmod - all in all quite annoying.
That's why I added the function shown below to my ~/.bashrc

np() {
        gplfile=~/Dokumente/gpl.txt
        if [ $# -eq 0 ]
        then 
                echo "filename required..."     
                return  
        fi
        if [ -e "$1" ] 
        then
                echo "file already exists!"
                return
        fi
        touch "$1" || { echo "can't touch $1" ; return ; }
        echo "#!/usr/bin/perl" >> "$1"
        if [ "$2" = "gpl" ] && [ -e "$gplfile" ]
        then
                cat "$gplfile" >> "$1"
        fi
        echo "" >> "$1"
        echo "use strict;" >> "$1"
        echo "use warnings;" >> "$1"
        echo "use 5.10.0;" >> "$1"
        echo "use feature 'say';" >> "$1"
        echo "" >> "$1"
        chmod 700 "$1"
        [ $EDITOR ] || EDITOR=vim
        $EDITOR "$1"
}

Usage: np filename [gpl]

Put the following in your ~/.bashrc

up() {
        if [ $# == 0 ]
        then 
                cd ..
                return  
        fi
        if [ "${1//[^0-9]/}" != "$1" ]
        then
                echo "Not a number"
                return
        fi
        STRING=""
        for (( i=0; i<$1 ; i++ ))
        do 
                STRING="$STRING../"
        done
        cd $STRING
}

up is equivalent to cd .. and up N jumps up N directories in the directory tree.

Some weeks ago, my laptop suddenly turned off, because its battery was completely flat. To prevent this from happening again, I wrote a small script that notifies me, when a critical charge state is reached. Additionally it shuts the computer down before the battery does. ;-)
Please note that this isn't meant to be a general purpose solution, so feel free to adapt it to your own needs.

Ich habe ein kurzes Einsteigertutorial zur Verwendung von GNU screen verfasst. Zu finden ist es hier.

Indenting a whole file in Vim is pretty easy: Type the following in normal mode

ggVG=

Done!

A few days ago, I stumbled across Volker Birk's blog. 'Cause I really liked the design, I decided to rebuild my own website using NanoBlogger.
Although I'm not completely satisfied with it yet, I think the result's already pretty considerable. :-)
BTW: The old site is still available here.

Find all numbers from 1 to 999999, which are palindromic in base 2 and base 16.

echo ${var:0:${#var}-1}
echo ${var%?}
echo $var | sed 's/.$//'

You could also use chop ;)

ls -d */ 
ls -l | grep ^d
find . -maxdepth 1 -type d
ls -F | grep /$
ls -1 | while read line; do if [ -d "$line" ]; then echo $line; fi; done
ls -1|while read l;do [ -d "$l" ]&&echo $l;done
perl -e 'foreach(glob(".* *")){print "$_\n" if (-d $_)}'
perl -e 'opendir(DIR,".");foreach(readdir(DIR)){print $_ ."\n" if(-d $_);}'
just kidding ;)
...

zig-zag scan in Perl :-)

$width = @{$array[0]};
$height = @array; 

tr A-Za-z N-ZA-Mn-za-m < file

echo 1234 | sed 's/\(.\)/\1\+/g' | sed 's/.$//' | bc -l
perl -e 'print eval join "+", split //, 12345;' 

Another password generator, written in perl. As it's more advanced than the old bash script I recommend using this one, if you're to lazy to create a secure password by yourself. The special thing about this script is, that it's possible to specify the characters, that will occur in the password (e.g. it's possible to create a password, containing just the letters a, b and c (don't do this...))

A simple shell script, that generates a random password from a given set of characters.

Ever wanted to kick multiple users with just one command? 

kick.pl makes it possible!

Usage:

This script provides a fast way to "search" wikipedia from irssi.

Example:

prints http://de.wikipedia.org/wiki/Rolling_Stones in the current channel

and 

expands to http://en.wikipedia.org/wiki/Rolling_Stones


Note: this script requires curl.

Folding@home (F@H) is the most powerful distributed computing cluster in the world and one of the world's largest distributed computing projects. The goal of the project is "to understand protein folding, misfolding, and related diseases."
To keep everyone on IRC informed about my current work progress, I created this small script. :-)

Note: this script requires curl.

This is a nowplaying script for moc and irssi. It also enables you to control moc from irssi. I recommend applying my patch to moc, as it's the only way to determine whether you turned shuffle/repeat on or off.

Usage:

/mocnp         prints the currently played song in the active channel 
/play          starts playing, if moc's in state "pause"
/pause         pause the current song
/start         starts moc if it's not running or if it's in mode "stop"
/stop          stops moc
/next          next song
/prev          previous song
/shuffle       turns shuffle on/off (requires >=mocp 2.5)
/repeat        turns repeat on/off (requires >=mocp 2.5)
 

This script displays a nicklist on the top of your irssi-window. Since it uses the split function of irssi, it works without any external programs. Although it works fine for me, a newer, better version will come soon...

A lot of moc's functions can be easily controlled via command-line switches.  Unfortunately, by default, there's no way to determine whether shuffle/repeat is turned on or off, without checking the ncurses-interface of moc. So, I created a small patch, that enables moc to display these two values along with the song information on the command-line.

Applying this patch is pretty easy:



Example for the altered output:

State: PAUSE
File: /my/favorite/musicfile.mp3
Title: foobar
Artist: foo
SongTitle: foobar
Album: bar
TotalTime: 01:28
TimeLeft: 00:54
TotalSec: 88
CurrentTime: 00:34
CurrentSec: 34
Bitrate: 192Kbps
AvgBitrate: 199Kbps
Rate: 44KHz
Shuffle: on
Repeat: off

yaydl - more than a youtube downloader!

Currently supports:

• youtube
• metacafe.com
• clipfish.de
• myvideo.de
• video.google.com
• vimeo.com
• dailymotion
• sevenload
• video.golem.de
• downloading of multiple videos "simultaneously"
• encoding from flv to xvid using mencoder or ffmpeg
• extracting the soundtrack of a video using ffmpeg or mplayer+lame
• md3-tagging of the extracted sound-files
• auto-renaming
• support for HD videos on youtube/dailymotion

Requirements:

• Getopt::Long
• LWP::UserAgent
• MP3::Info
• Term::ProgressBar

On debian-based systems, a apt-get install libwww-perl libgetopt-long-descriptive-perl libmp3-info-perl libterm-progressbar-perl will suffice.

Installation:

Just run the included install file. :-)

Changelog

Download the current version:

Now that's something pretty useless...

A simple MD5 brute forcer, written in C.

It calculates all combinations of a given set of characters and compares the MD5 sum of each combination to a given hash. brute calculates about 3 million hashes per second on a Pentium 4 (2,6 GHz).

Usage:

length represents the maximal length of a string, i.e. if it's 6, brute won't try words longer than 6 characters.
hash is a md5-hash, for example 5cfa779519a9789fad5dfe0de784ee4c

The basic syntax is: nb [-b blog_dir] [options]

How to ...

• create new weblog (directory) = nb -b [blog_dir] -a
• create new entry = nb -a
• create new category = nb -c new -a
• create new entry with category = nb -c [cat_id] -a
• list entries = nb -l [all|DATE|max]
• list categories = nb -l cat
• list entries by category = nb -c [cat_id] -l [all|DATE|max]
• edit entry = nb -e [entry_id]
• move entry to category = nb -c [cat_id] -m [entry_id]
• delete entry = nb -d [entry_id]
• delete category = nb -c [cat_id] -d cat
• delete entry from category = nb -c [cat_id] -d [entry_id]
• draft entry = nb -E [draft_file]
• import draft as entry = nb -f [draft_file] -a
• force update of weblog files = nb -u [all|DATE|main]

Thank you for trying NanoBlogger. Please direct comments and suggestions to the mailing list or submit a bug report to the project page on sourceforge.net.