Merge or Encrypt / Decrypt PDF files using pdftk

Pdftk is a simple command line tool for doing everyday things with PDF documents. Use it to merge PDF documents, split PDF pages into a new document, decrypt input as necessary (password required), encrypt output as desired, fill PDF forms with FDF data and/or flatten forms, apply a background watermark, report on PDF metrics, update PDF metadata, attach files to PDF pages or the PDF document, unpack PDF attachments, burst a PDF document into single pages, decompress and re-compress page streams, and repair corrupted PDF files (where possible).

Installation:
Ubuntu user can install pdftk using following command: sudo apt-get install pdftk

Using pdftk:
Once installed, we can merge pdf files using following command:

pdftk 1.pdf  2.pdf  3.pdf cat output 123.pdf

Encrypt a PDF using 128-Bit Strength (the Default) and Withhold All Permissions (the Default)

pdftk mydoc.pdf output mydoc.128.pdf owner_pw foopass

Decrypt a PDF

pdftk secured.pdf input_pw foopass output unsecured.pdf

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Install Group of Sofware on Ubuntu using Tasksel

Tasksel is an installation system that is an integral part of the Debian installer (it is also included in Ubuntu). Tasksel groups software packages by tasks and offers an easy way to install all the packages needed for that task. It provides the same functionality as using conventional meta-packages.

Installation
Tasksel is present on all versions of Ubuntu's installer

Usage
To run tasksel from the command line, type: sudo tasksel
the tasksel menu will be shown:

Already-installed tasks will have an asterisk beside their name. Select a task by scrolling down and pressing space. This will put an asterisk beside the selected task and mark it for installation. Removing an asterisk marks the task for removal. Once "ok" is selected the task installations and/or removals will take place using apt-get.

Command line arguments
You can also directly specify which task to install.
For instance, to add the Apache-MySQL-PHP stack to an existing system:

sudo tasksel install lamp-server

For complete options, see the tasksel manpage: man tasksel

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Search News, Bug fixes, Tips and Tricks, etc. for Ubuntu using Googlubuntu search Engine

Googlubuntu is a search engine created by Google to search news, bug fixes, tips and tricks, etc.. for Ubuntu and Kubuntu Linux

With this tool you can easily search, programs, tutorials, documents, grants, news and much more. For that Googlubuntu indexes sites in both Spanish and English.

Googlubuntu resources are from: Ubuntu.com, Kubuntu.com, Edubuntu.org, Launchpad.net, ubuntuforums.org, Kubuntuforums.net, ubuntuguide.org, getdeb.net, google groups «ubuntulinux» and «kubuntu», ubuntu-es.org, kubuntu-es.org, planetubuntu.es, ubuntips.com.ar, guia-ubuntu.org, cesarius.net, tuxpepino.wordpress.com, ubuntulife.wordpress.com, google groups on spanish.

In addition and if you're using Firefox, you can use Googlubuntu firefox plugin to add Googlubuntu search bar.

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Tweet from command line using curl

curl is a client to get documents/files from or send documents to a server, using any of the supported protocols (HTTP, HTTPS, FTP, GOPHER, DICT, TELNET, LDAP or FILE). The command is designed to work without user interaction or any kind of interactivity.

curl offers a busload of useful tricks like proxy support, user authentication, ftp upload, HTTP post, SSL (https:) connections, cookies, file transfer resume and more

curl is availabe mostly on all Linux distros but you can download a binary package from cURL's download page if you don't have it installed.

Open the terminal and past the below mentioned command to send the status to the twitter

curl --basic --user username:password --data status="Linux" http://twitter.com/statuses/update.xml

command explanation
--basic --user username:password

The above piece of code will authenticate your Twitter username and password.

--data status="Linux"

The above piece of code will send the data to the API i.e your new status which will be in the form of POST HTTP request.

http://twitter.com/statuses/update.xml

The main part of the code which is the URL of the Twitter API.

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