rip mp3 under ArchLinux

First you have to install sound-juicer, by:

	sudo pacman -S sound-juicer

Run “sound-juicer” will call the sound-juicer out, remember the pulse-audio should be started before the sound-juicer is called.

On start, sound juicer will automatically scan the CD-ROM, and retrieve back the track listing, this will take for a while. Sorry, failed. …

goobox is only a CD Player

grip is good, just use it for cd mp3 gripping.

After gripping the sound-track, the generated mp3 file is listed under the directory that your specified, with a m3u file and the mp3 fils. Here comes a new problem, how to rename from the m3u file?
Following is the bash script for doing this:

#!/bin/bash
number=0
# Make the directory for processed result
mkdir -p ./changed
underscore="_"
for filename in `cat ./verschiedene_knstler-piano_piano.m3u`
do
	number=`expr $number + 1`
	# How to get the filename? 
	file_basename=`basename $filename`
	#echo $file_basename
	if [ $number -lt 10 ]
	then
		# Add 0 before the number,
		# and form the name like "01_abc"
		zeroprefixname="0$number$underscore$file_basename"
		echo $zeroprefixname
		cp $filename ./changed/$zeroprefixname
	else
		# The name needn't add 0
		prefixname=$number$underscore$file_basename
		echo $prefixname
		cp $filename ./changed/$prefixname
	fi
done

Adding Battery Widget and ACPI Notification in Awesome

For keeping the “Clean Desktop”, the cleaner in my office unpluged my laptop’s powerline, and the laptop suddenly going to black when I was coding, so I want to write some scripts for calculating the battery’s power percentage and got notification when the power of the battery is too low. ###Add an indicator in Awesome Desktop Awesome have a very good 3rd-party library called “Vicious”, its page is athttp://awesome.naquadah.org/wiki/Vicious, following the guideline for install and configure it. Install the library:

	$ cd ~/.config/awesome
	$ git clone http://git.sysphere.org/vicious

Modify the rc.lua to add following lines:

-- Using vicious
-- Vicious is a modular widget library for awesome, derived from the Wicked widget library. 
vicious = require("vicious")

-- Add the Battery 
mybattery = wibox.widget.textbox()
vicious.register(mybattery, vicious.widgets.bat, "||Battery: $2% ", 30, "BAT0")

-------------------------------------
right_layout:add(mytextclock)
-- We add mybattery here!
right_layout:add(mybattery)
right_layout:add(mylayoutbox[s])
-------------------------------------

After modification, save the rc.lua and restart the awesome desktop, you will see the following pictures. ###Add notification when battery is too low We can use acpi for getting the battery and power supply information, so first let’s install it:

	$ sudo pacman -S  acpi

Then we can write an script named notifybattery.sh, put it under the /bin folder:

battery_level=`acpi -b | grep -P -o '[0-9]+(?=%)'`
if [ $battery_level -le 10 ]
then
    notify-send "Battery low" "Battery level is ${battery_level}%!"
fi

Then we add an item under crotab:

	$ crontab -e
	# crontab's configuration:
	2 * * * * /bin/notifybattery.sh

Now we can got an indication when battery is less than 10%. you can adjust the number to whatever you want.

Write Local ntp sync server

Due to frequently query the ntp webserver, the website is banned by the administrator, thus I have to think about another way for updating the local machine’s time on OpenWRT.
First, install the coreutils-date: opkg install coreutils-date Add the no-login for local server: cat id_rsa.pub | ssh ddddd@1xx.xxx.xxx.xxx ‘cat >.ssh/authorized_keys’ Now you can directly call remote command via: ssh ddddd@1xx.xxx.xxx.xxx ls OK, we update the time.sh

#!/bin/sh
#echo $http_proxy
#echo $https_proxy
#date $(wget -O - "http://www.timeapi.org/utc/in+eight+hours" 2>/dev/null | sed s/[-T:+]/\ /g | awk '{print $2,$3,$4,$5,".",$6}' | tr -d " " )
timestring=`ssh ddddd@1xx.xxx.xxx.xxx date`
echo $timestring
/usr/bin/date -s "$timestring"

Add the following line into the crontab * */3 * * * /bin/time.sh Now you can enjoy the local server updated time.

Git Management of my repository

For create a new branch in the current repository:

	git branch <name_of_your_new_branch>

Then you can push the branch on github

	git push origin <name_of_your_new_branch>

If you want to switch to your new branch:

	git checkout <name_of_your_new_branch>

See all of the branches via:

	git branch

Also you can add multiply remote url via:

	git remote add <name_of_your_remote> <url>

Push all of your changes

	git push origin <name_of_your_remote>

Set a pelican based blog on Ubuntu

Install python-virtualenv:

	sudo apt-get install python-virtualenv

Install the virtualenv Wrapper:

	sudo apt-get install virtualenvwrapper

Now create the directory for holding the virtual environment:

	mkdir ~/pyv

Edit the virtualenv resource file:

	export WORKON_HOME="/home/Trusty/pyv"
	export PROJECT_HOME="/home/Trusty/pyv"
	#source /usr/bin/virtualenvwrapper.sh

Here we meet the problem, it says cannot find the /usr/bin/virtualenvwrapper.sh, I got the answer from the stackoverflow:

	From /usr/share/doc/virtualenvwrapper/README.Debian:
	
	In contrast to the information in
	/usr/share/doc/virtualenvwrapper/en/html/index.html this package installs
	virtualenvwrapper.sh as /etc/bash_completion.d/virtualenvwrapper.
	
	Virtualenvwrapper is enabled if you install the package bash-completion and
	enable bash completion support in /etc/bash.bashrc or your ~/.bashrc.
	
	If you only want to use virtualenvwrapper you may just add
	
	 source /etc/bash_completion.d/virtualenvwrapper
	
	to your ~/.bashrc.

So the right command should be:

	$ cat /home/Trusty/.virtualenvrc 
	export WORKON_HOME="/home/Trusty/pyv"
	export PROJECT_HOME="/home/Trusty/pyv"
	source /etc/bash_completion.d/virtualenvwrapper

Now add this find into .bashrc and source~/.bashrc again:

	$ tail -1 ~/.bashrc 
	source /home/Trusty/.virtualenvrc
	$ source ~/.bashrc	

Good!!! Now you can continue with the following steps, just as we noticed in previous articles.