sudo apt-get install nrg2iso

Usage:

nrg2iso [filename.nrg] [filename.iso]

Example:

nrg2iso cdImage.nrg cdImage.iso

Now you can easy to mount or burn your iso file in Ubuntu.

Examples:

Merge PDF Documents
Merge Two or More PDFs into a New Document
pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf
or (Using Handles):
pdftk A=1.pdf B=2.pdf cat A B output 12.pdf
or (Using Wildcards):
pdftk *.pdf cat output combined.pdf
“cat” is short for concatenate. Pdftk doesn’t retain bookmarks, but it does keep hyperlinks to both destinations within the PDF and to external files or Web sites. Where some other applications point to the wrong destinations for hyperlinks, the links in PDFs combined using pdftk managed to hit each link target perfectly.

Split PDF Pages into a New Document
pdftk A=one.pdf B=two.pdf cat A1-7 B1-5 A8 output combined.pdf

Remove Pages from PDF Documents
Remove ‘page 13′ from in1.pdf to create out1.pdf
pdftk in.pdf cat 1-12 14-end output out1.pdf
or (Using Handles):
pdftk A=in1.pdf cat A1-12 A14-end output out1.pdf
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The gscan2pdf is a GUI program to directly create a multipage PDF from a scan. It should work on almost any Linux/BSD system.

How to install the gscan2pdf in Ubuntu or Debian-based system

First you need to add the following line to your /etc/apt/sources.list file:

deb http://gscan2pdf.sourceforge.net/download/debian binary/

Then you need to update the source list with the following command:

apt-get update

Now you can install gscan2pdf with the following command:

apt-get install gscan2pdf

I use a simple scan Canon CanoScan N655U. I test gscan2pdf to scan a color and a normal A4 form pages with different scan model and dips. I become the following results:

At first, we should know what does dpi mean and how much dpi is enough.
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Sissi 又长大了，她现在特别喜欢爬高上低，沙发，床，椅子都是她练习的好场所。

一天，她自己搬了个小板凳放在客厅的茶几旁，然后先上了小板凳，接着又麻利的爬上了茶几，最后她站在茶几上高兴的来回走动。大人想过来扶着她，她还不愿意呢。

今天，Sissi 午觉醒来后，爬上了床上叠好的被子，然后对奶奶说，高！奶奶问她，Sissi， 你怕不怕？ Sissi 就连忙爬了下来，然后搂着奶奶的脖子说，怕！怕！

You can also use bchunk to convert bin/cue CD-images to iso Image.
bchunk movie.bin movie.cue movie

Then you can mount the iso image use:
mount -t iso9660 -o loop [isofile] [mountpoint]

To burn a CD, I use the GnomeBaker or Bracero CD Burner.

ref.: CD ripping and burning from the command prompt Howto

How to install RAR Archive Compression and Decompress Software in Ubuntu (rar)

Prerequisites: add universe and multiverse repositories in you sources.list.

Then open a terminal window and type in:
sudo apt-get install rar

How to use rar

To extract a rar archive file to the current directory, use e option
rar e filename.rar

To extract a rar archive to a folder
rar e filename.rar foldername/

To extract a rar archive with full pathname and directory if the archive have its inside, use x option
rar x filename.rar
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当 Oma 在厨房做饭的时候，由于油烟大，而且菜下锅的时候声音也很大， 就让 Sissi 离厨房远一些，去客厅或书房玩一会儿。于是 Sissi 就远远的跑开，双手捂住小耳朵，然后大声叫着：啪！！！啪！！！学着菜下锅时发出的啪啪声音。

今天，Oma 在厨房做饭，Sissi 在客厅独自玩耍。过了一会，Oma 没有听见 Sissi 的动静或声响，便有些担心的叫道： Sissi ，你在哪儿？ 话音才落，就听见客厅里传来 Sissi 用力的回答：哎！！！

Unlike some other archiving programs, and consistent with the Unix philosophy that each individual program should be designed to do only one thing but do it well, tar does not perform compression. However, it is very easy to compress archives created with tar by using specialized compression utilities.

The basic tar syntax is
tar option(s) archive_name file_name(s)

Remember certain option defined, c for create, z for extract and t for test. v verbose, and f is file. There are two common archive formats that people are interested in, tar.bz2 and tar.gz (tgz). tar.bz2 is more compress than tar.gz, but tar.gz is faster for creating and extracting.

Create and Compress

To create a tar.gz archive, if given list of files, use option z to indicate tar.gz:
tar czvf filename.tar.gz myfile1 myfile2 myfile3
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