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20140607-5 选题
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Nuvola Player 2.4.0 Released – A Online Cloud Music Player for Linux
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================================================================================
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**Nuvola Player** is an open source player that runs cloud music services such as Amazon Cloud Player, Bandcamp, Deezer, 8tracks, Google Play Music, Grooveshark, Hyper Machine and Pandora in its own web interface and provides integration with a Linux desktop.
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This application comes with lots of features in the form of plugins such as desktop notifications, system tray, multimedia keys, media player applets, dock menu, lyrics, last.fm and much more.
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On **May 31st 2014**, A new version of **Nuvola Player 2.4.0** was released – which brings a few new features, including two new services such as Logitech Media Server and This is My Jam with numerous bug fixes.
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### What’s new in this release ###
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- Deleted broken Hide Google+ buttons option, because Google changes the code too regularly.
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- Service settings are now applied quickly without reload.
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- The pause and toggle play/pause behaviour have been fixed.
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- Added a caution about compatibility problems with desktop notifications for Chrome.
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- The in-page navigation buttons have been implemented (now users will find buttons in the top bar next to the Google Play logo).
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- A new Logitech Media Server and This is My Jam services has been added.
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- Included support for back/ forward mouse buttons.
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- Fixed support for actionable notification in the GNOME lock screen.
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For a complete list of features, visit at official release [announcement page][1].
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### Installing Nuvola Player in Debian, Ubuntu and Linux Mint ###
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The official Nuvola Player repository contains binary packages for **Ubuntu 14.04, 13.10, 12.10, 12.04** and **Linux Mint 17, 16, 15, 14.** You can install binary package ‘nuvolaplayer‘ by adding Nuvola Player repository under your system.
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#### On Ubuntu and Linux Mint ####
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Open a terminal and run the following series of commands in the terminal.
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$ sudo add-apt-repository ppa:nuvola-player-builders/stable
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$ sudo apt-get update
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$ sudo apt-get upgrade
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$ sudo apt-get install nuvolaplayer
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**Note**: Please don’t skip system updates command ‘sudo apt-get upgrade‘. Otherwise, your apt-get may fail to install Flash plugin.
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If you wish to install Nuvola Player without Flash plugin support, you can skip that system upgrade command and use the following command to install nuvolaplayer without Flash support.
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$ sudo apt-get --no-install-recommends install nuvolaplayer
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#### On Debian ####
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For **Debian Wheezy** and **Debian Sid** the stable Nuvola Player binary packages available from official repository. Using this repository, you can install latest stable version using the following bunch of commands.
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Firstly, Open a terminal and import a public key, and then add the repository to ‘**sources.list**‘ file and then do a system update to install nuvolaplyer as shown below.
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#### Debian Wheezy ####
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$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 706C220A
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$ sudo sh -c 'echo "deb http://ppa.fenryxo.cz/nuvola-player/ wheezy main" >> /etc/apt/sources.list'
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$ sudo sh -c 'echo "deb-src http://ppa.fenryxo.cz/nuvola-player/ wheezy main" >> /etc/apt/sources.list'
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$ sudo apt-get update
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$ sudo apt-get install nuvolaplayer
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#### Debian Sid ####
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$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 706C220A
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$ sudo sh -c 'echo "deb http://ppa.fenryxo.cz/nuvola-player/ sid main" >> /etc/apt/sources.list'
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$ sudo sh -c 'echo "deb-src http://ppa.fenryxo.cz/nuvola-player/ sid main" >> /etc/apt/sources.list'
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$ sudo apt-get update
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$ sudo apt-get install nuvolaplayer
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**Note**: Nuvola Player depend on wrapped Flash plugin, which is not installed by default due to conflicting libraries (**GTK+ 2** and **GTK+ 3**).
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To workaround this problem, we enable component flash **PPA** to install package ‘**nuvolaplayer-flashplugin**‘ using the following commands.
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$ sudo sh -c 'echo "deb http://ppa.fenryxo.cz/nuvola-player/ sid main beta flash" >> /etc/apt/sources.list'
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$ sudo sh -c 'echo "deb-src http://ppa.fenryxo.cz/nuvola-player/ sid main beta flash" >> /etc/apt/sources.list'
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$ apt-get update
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$ apt-get install nuvolaplayer-flashplugin
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Once you done with the installation, you will find the application in **Menu** to launch it. Keep in mind, you must have internet connection in order to listen music online.
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### Nuvola Player Screen Shots ###
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Select Music Services
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Grooveshark Music Service
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Grooveshark Playing Music
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Nuvola Player Preferences
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Google Play Music
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Rdio Music Service
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About Nuvola Player
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For other Linux distributions, you can download source tarball packages at Nuvola Player [launchpad downloads][2] page.
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/install-nuvola-player-in-linux/
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译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://nuvolaplayer.fenryxo.cz/releases/2.4.html
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[2]:https://launchpad.net/nuvola-player/+download
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Practical Interview Questions and Answers on Linux Shell Scripting
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================================================================================
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With the overwhelming response we are getting on the Interview Series articles, the first of its kind on any Linux How-to website in the form of Likes, Feedbacks in comment as well as on personal Email Address make us going from one article to the next article.
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Here is the link to the [Interview Series][1] articles already published on Tecmint.com, where we have covered lots of topics viz., FTP, MySQL, Apache, Scripting, Linux Commands, etc.
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Practical Interview Question on Shell Scripting
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Continuing to the above series here we are coming with another 5 wonderful Linux Interview Questions and their answer. Your (The Tecmint.com Readers and frequent Visitors) support is always needed to make it successful.
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### 1. Write a shell script to get current date, time, user name and current working directory. ###
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> **Answer** : The commands logname, date, who I am and pwd will output username, current date and time, and current working directory. Just implementing these commands in the script and making it a bit interactive.
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Now create a file called ‘**userstats.sh**‘ and add the following code to it.
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#!/bin/bash
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echo "Hello, $LOGNAME"
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echo "Current date is `date`"
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echo "User is `who i am`"
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echo "Current directory `pwd`"
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Place execute permission and run the script as shown below.
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# chmod 755 userstats.sh
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# ./userstats.sh
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#### Sample Output ####
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Hello, avi
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Current date is Sat Jun 7 13:05:29 IST 2014
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User is avi pts/0 2014-06-07 11:59 (:0)
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Current directory /home/avi/Desktop
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### 2. Write a Shell Script that adds two numbers if provided as the command Line Argument and if the two numbers are not entered it outputs an Error Message along with a one-Line of how-to use description. ###
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> **Answer** : Here is the simple Shell Script along with description which adds two number if provided as Command-Line argument, if not it throws error with single line on how to use the script.
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Again create a file called ‘**two-numbers.sh**‘ and add the following content to it.
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#!/bin/bash
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# The Shebang
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if [ $# -ne 2 ]
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# If two Inputs are not received from Standard Input
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then
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# then execute the below statements
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echo "Usage - $0 x y"
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# print on standard output, how-to use the script (Usage - ./1.sh x y )
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echo " Where x and y are two nos for which I will print sum"
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# print on standard output, “Where x and y are two nos for which I will print sum ”
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exit 1
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# Leave shell in Error Stage and before the task was successfully carried out.
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fi
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# End of the if Statement.
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echo "Sum of $1 and $2 is `expr $1 + $2`"
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# If the above condition was false and user Entered two numbers as a command Line Argument,
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it will show the sum of the entered numbers.
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Set executer permission on the file and run the script as shown below.
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# chmod 755 two-numbers.sh
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**Condition 1**: Running the script without entering two numbers as command line argument, you will get the following output.
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#### Sample Output ####
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# ./two-numbers.sh
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Usage - ./two-numbers.sh x y
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Where x and y are two nos for which I will print sum
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**Condition 2**: When Numbers are entered as command line argument you will get the result as shown.
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$ ./two-numbers.sh 4 5
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Sum of 4 and 5 is 9
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Hence the above shell script fulfills the condition as suggested in the question.
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### 3. You needs to print a given Number say 10572, in reverse order using a Shell script such that the input is provided using command Line Argument only. If the input data is not provided as Command Line Argument, it should throw and error and should suggest, how to use the script. Write the script but before that tell me the algorithm that needs to be implemented here. ###
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#### Algorithm ####
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1. Let the Input Number = n
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1. Set rev=0, sd=0 (Reverse and single digitis set to 0)
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1. n % 10, will find and give single left most digit
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1. reverse number is generated as rev * 10 + sd
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1. Decrease Input Number (n) by 1.
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1. if n > 0, then goto step 3 else goto setp 7
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1. Print rev
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Now again, create a file called ‘**numbers.sh**‘ and add the following given code it.
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#!/bin/bash
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if [ $# -ne 1 ]
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then
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echo "Usage: $0 number"
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echo " I will find reverse of given number"
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echo " For eg. $0 0123, I will print 3210"
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exit 1
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fi
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n=$1
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rev=0
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sd=0
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while [ $n -gt 0 ]
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do
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sd=`expr $n % 10`
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rev=`expr $rev \* 10 + $sd`
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n=`expr $n / 10`
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done
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echo "Reverse number is $rev"
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Grant a execute permission on the file and run the script as shown below.
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# chmod 755 numbers.h
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**Condition 1**: When Input is not provided as command line argument, you will get the following output.
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#### Sample Output ####
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./numbers.sh
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Usage: ./numbers.sh number
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I will find reverse of given number
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For eg. ./2.sh 123, I will print 321
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**Condition 2**: When Input was provided as command line Argument.
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$ ./numbers.sh 10572
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Reverse number is 27501
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The above script worked perfectly and the output was just what we needed.
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### 4. You are supposed to calculate a real number calculation directly from terminal and not any shell script. What will you do (say the real numbers are 7.56 and 2.453)? ###
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> **Answer** : We need to use bc command in a special way as described below. The output of echo 7.56 + 2.453 should be pipelined to bc.
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For example, run the following command to calculate numbers in real time using bc command as shown.
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$ echo 7.56 + 2.453 | bc
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10.013
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### 5. You are supposed to find the value of pi upto 100 places of decimal, what is the easiest way to get the result done. ###
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> **Answer** : The easiest way to find the value of pi, correct upto 100 places of decimal we just need to issue the below command.
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# pi 100
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3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067
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Obviously! We must have package ‘**pi**‘ installed. Just do a **apt** or **yum** to get a required package to install ‘**pi**‘ onto the distribution you are using.
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That’s all for now. I’ll be here again with another interesting article very soon. Till then stay tuned and connected to Tecmint.com. Don’t forget to provide us with you valuable feedback in the comment section below.
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--------------------------------------------------------------------------------
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via: http://www.tecmint.com/practical-interview-questions-on-linux-shell-scripting/
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译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://www.tecmint.com/category/interview-questions/
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