Linux / CentOS xsel 1.2 install script(.sh)

If yum can't find xsel package by using 'yum install xsel'. You can install it via script:

1. cd /tmp/
2. #download
3. wget http://dl.fedoraproject.org/pub/epel/6/i386/xsel-1.2.0-8.el6.i686.rpm
4. yum -y install xsel-1.2.0-8.el6.i686.rpm
5. #remove backup
6. rm -f xsel-1.2.0-8.el6.i686.rpm
7. #check installation and see:
8. #xsel version 1.2.0 by Conrad Parker <conrad@vergenet.net>
9. xsel --version

Download script Install xsel 1.2.sh

sparkjava : problems passing urls as parameter to routes

With sparkjava you can build a helloworld website within lessthan a minute like Node Express (http://expressjs.com/).

Passing url parameters :
Consider creating a route like: http://host:port/url ( e.g. http://localhost:4567/https://finance.yahoo.com/q/ks?s=VNJTX+Key+Statistics )
whereas the black url portion you want to pass as parameter.
This can be done very easily using splats (http://sparkjava.com/documentation.html).
With the following code in your route:

1. port(8081);//lets start our server on port 8081
2. get("/", (request, response) -> "Welcome to HelloWorld Server! :)");
3. get("/*", (request, response) -> {
4.     String url = request.splat()[0];//take the first splat param value
5.     return "Requested url : " + url;
6.     });

And here the problem comes:

It prints:

1. Requested url : https:/finance.yahoo.com/q/ks

The first thing is that it has removed the query string.

On top of that https:/finance.yahoo.com/q/ks

is not a valid url.

See https://github.com/perwendel/spark/issues/304#issuecomment-114055123 and https://github.com/perwendel/spark/issues/304#issuecomment-114793493

To solve this:

We can simply do some manipulate on the urls ourselves:

Corrected codes:

1. get("/*", (request, response) -> {
2.     String url = request.splat()[0];//take the first splat param value
3.     url = manipulateUrl(url, request.queryString());
4.     return "Requested url : " + url;
5.     });
7. //let's modify url param
8. public static String manipulateUrl(String urlStr, String queryStr) throws URISyntaxException, MalformedURLException, UnsupportedEncodingException {
9.     urlStr = urlStr.replaceFirst("/", "//");
10.     if (queryStr.length() >= 0) {
11.         urlStr = urlStr + "?" + queryStr;
12.     }
13.     return urlStr;
14.     }

java exception : Expected org.codehaus.plexus.components.io.resources.PlexusIoArchivedResourceCollection, got org.codehaus.plexus.components.io.resources.PlexusIoFileResourceCollection

Running maven command with maven assembly plugin

1. mvn clean compile assembly:single

may some times throw:

Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.4:single (default-cli) on project : Failed to create assembly: Error adding file-set for to archive: Expected org.codehaus.plexus.components.io.resources.PlexusIoArchivedResourceCollection, got org.codehaus.plexus.components.io.resources.PlexusIoFileResourceCollection -> [Help 1]

This may happen if by any chances maven project structure is not standard.For example: if it misses src/main/java

Non-standard structure:
src->com->company->package->files
Standard structure:
src->main->java->com->company->package->files

Solution:

1. #navigate to project dir where pom.xml exists
2. cd PROJECT_DIR
3. cd src
4. #create directories
5. mkdir main/
6. mkdir main/java/
7. #move source packages & files into src/main/java directory.
8. mv com/ main/java/

Laravel 4 : UnexpectedValueException (The stream or file LOG_FILE could not be opened: failed to open stream: No such file or directory)

The stream or file "PROJECT_ROOT/app/storage/logs/LARALVEL_LOG_FILE" could not be opened: failed to open stream: No such file or directory

This may happen when laravel can' find log file.
One solution is to create logs dir manually :

1. #Goto your laravel project dir. Do the following on terminal:
2. mkdir app/storage/logs
3. 
   
4. #incase you forgot file permissions
5. chmod -R 777 app/

Update git 1.7 to most recent version 2.0.4 on centos 6 script

#install dependencies

yum -y install curl-devel expat-devel gettext-devel openssl-devel zlib-devel && yum -y install gcc perl-ExtUtils-MakeMaker

#remove old version

yum -y remove git

#install git 2 most recent src

cd /usr/src

wget https://www.kernel.org/pub/software/scm/git/git-2.0.4.tar.gz

tar xzf git-2.0.4.tar.gz

#remove backup

rm -f git-2.0.4.tar.gz

#build git

cd git-2.0.4

make prefix=/usr/local/git all

make prefix=/usr/local/git install

#add to path

echo "export PATH=$PATH:/usr/local/git/bin" >> /etc/bashrc

source /etc/bashrc

#verify successful installation

git --version

Parsing xml response data with Nodejs

1. <?xml version="1.0" encoding="UTF-8"?>
2. <ns2:urlset xmlns:ns2="http://www.sitemaps.org/schemas/sitemap/0.9" hc="a3">
3. <url>
4. <loc>http://www.flipclub.com/</loc>
5. <lastmod>2015-06-09</lastmod>
6. <changefreq>daily</changefreq>
7. <priority>1.0</priority>
8. </url>
9. <url>
10. <loc>http://www.flipclub.com/flashcard/46/3rd-Grade:-Ancient-Rome-Flashcards</loc>
11. <lastmod>2015-06-09</lastmod>
12. <changefreq>daily</changefreq>
13. <priority>1.0</priority>
14. </url>
15. <url>
16. <loc>http://www.flipclub.com/flashcard/47/7th-Grade:-Social-Studies-Flashcards</loc>
17. <lastmod>2015-06-09</lastmod>
18. <changefreq>daily</changefreq>
19. <priority>1.0</priority>
20. </url>
21. <url>
22. <loc>http://www.flipclub.com/flashcard/1068/ACT-English-Game-Set-2-Flashcards</loc>
23. <lastmod>2015-06-09</lastmod>
24. <changefreq>daily</changefreq>
25. <priority>1.0</priority>
26. </url>
27. <url>
28. <loc>http://www.flipclub.com/flashcard/1070/ACT-Exam-Math-Game-Set-1-Flashcards</loc>
29. <lastmod>2015-06-09</lastmod>
30. <changefreq>daily</changefreq>
31. <priority>1.0</priority>
32. </url>
33. <url>
34. <loc>http://www.flipclub.com/flashcard/1069/ACT-Exam-Science-Game-Set-1-Flashcards</loc>
35. <lastmod>2015-06-09</lastmod>
36. <changefreq>daily</changefreq>
37. <priority>1.0</priority>
38. </url>
39. </ns2:urlset>

Sample Parsed Output:-

http://flipclub.com/
http://flipclub.com/flashcard/46/3rd-Grade:-Ancient-Rome-Flashcards
http://flipclub.com/flashcard/47/7th-Grade:-Social-Studies-Flashcards
http://flipclub.com/flashcard/1068/ACT-English-Game-Set-2-Flashcards
http://flipclub.com/flashcard/1070/ACT-Exam-Math-Game-Set-1-Flashcards
http://flipclub.com/flashcard/1069/ACT-Exam-Science-Game-Set-1-Flashcards

Codes:-

1. var url = "http://flipclub.com/sitemap.xml";//get xml from sample sitemap.xml
3. var http = require("http");
4. var parseString = require('xml2js').parseString;//make sure you have installed xml2js with "npm install xml2js"
6. var req = http.get(url, function(res) {
7. // save the data
8. var xml = '';
9. res.on('data', function(chunk) {
10. xml += chunk;
11. });
13. res.on('end', function() {
14. parseString(xml, function(err, result) {
15. var items = result['ns2:urlset']['url'];
16. items.forEach(function(entry) {
17. console.log(entry['loc'][0]);
18. });
19. });
20. });
22. });
24. req.on('error', function(err) {
25. // debug
26. console.log(err);
27. });

Install I2P server 0.9.20 on CentOS Script(*.sh)

Download & install I2p:

1. mkdir /usr/local/i2p/
2. cd /usr/local/i2p/
3. wget --no-check-certificate https://download.i2p2.de/releases/0.9.20/i2pinstall_0.9.20.jar
4. java -jar i2pinstall_0.9.20.jar -console
5. #press 1
6. /usr/share/i2p/
7. #press 1

Configure for running server as root:

1. vim /usr/share/i2p/i2prouter

uncomment the line containing:

1. ALLOW_ROOT=true

Start I2p service:

1. sh /usr/share/i2p/i2prouter start

A browser window should open pointing at

http://127.0.0.1:7657/home

see logs:

1. tail -f /root/.i2p/logs/log-router-0.txt
2. tail -f /root/.i2p/wrapper.log

stopping service:

1. sh /usr/share/i2p/i2prouter stop

Uninstall i2p server:

1. sh /usr/share/i2p/i2prouter stop
2. rm -rf /root/.i2p/
3. rm -rf /usr/local/i2p/
4. rm -rf /usr/share/i2p/

References:

http://techinfozone.net/install-i2p-server-centos-linux/