Linux Tutorials

Is your security worth its salt? Try this assessment strategy to find out.
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With grub2 you can directly boot an (iso9660) ISO using its loopback option. This is great because it provides another nice rescue scenario - for example when using grml (the Debian based Linux Live-CD for sysadmins). You no longer need to extract kernel and initrd from the ISO to be able to boot it using the isofrom bootoption. All you need to do is put a plain grml ISO to your harddisk.Read more..

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From time to time I am asked to break a password on an Adobe PDF file. This mostly comes up when the user who created the pdf can’t remember what their own password is. As annoying as that is, actually recovering the password is simple using pdfcrack.

PDFCrack is a GNU/Linux application (or any other POSIX-compatible system) tool for recovering passwords and content from PDF-files. It is small, command line driven, and without external dependencies. PDFCrack is released under GPL.

Install pdfcrack on Ubuntu by typing:
sudo aptitude install pdfcrack

Run a quick benchmark by entering the following at the command line:
pdfcrack -b

Results:

Benchmark: Average Speed (calls / second):
MD5: 2616026.7
MD5_50 (fast): 146928.3
MD5_50 (slow): 107780.3

RC4 (40, static): 863985.7
RC4 (40, no check): 864661.2
RC4 (128, no check): 802203.0

Benchmark: Average Speed (passwords / second):
PDF (40, user): 653588.2
PDF (40, owner): 322317.1
PDF (40, owner, fast): 714278.6Read more..

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Have you ever just finished something important and all of a sudden the lights dim, your PC begins to sound like the clothes washer, and then bam, your work is gone? Been there, done that, got the t-shirt, right? Maybe I should have taken my watch off before sticking my hand in that running PC after all.

Well, the thing that annoys me most is, not losing the work, but knowing I’ll have to spend the next two days rebuilding the system just in order to recover whatever I was working on. Like a good boy, I save my work to multiple locations. If you care about it, don’t trust it to a computer, I always say. Strange advice from someone who is a computer professional.

Anyway, the solution to this problem has always been to ghost your system. Ghosting your system means making a backup image, applications and all, so that you can restore your system to a running state quickly. Strangely enough the product most people use to do this is called Ghost. Get it? Ghosting? If you have ever used the recovery CD that may have come with your system then you have probably used Ghost without knowing it.Read more..

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Instructions:

Download one of these iso files with or without default system upgrade.
I have split this iso into six peices to facilitate easy download.
Mediafire.com supports download managers so don't worry.
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From Windows to Linux:
The bottom Line
Linux Tips For Windows People
Win to Linux
Intro to Linux
Argentilinux.com (Spanish)

Windows / Linux equivalents:
The table of equivalents

ALL important Linux Links:
YoLinux
Loads of Linux Links
Linuxlinks.com
Eit.in Research and Linux Links
Arcturus Helpful Linux Links
Linux Command Line Cheat Sheets
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So you’ve installed a flavor of Linux such as Ubuntu or you have shell access to a Linux system and you want to start doing some damage. The admins at LXPages.com compiled 10 commands that every Newbie Linux user should definitely know to start being effective.

1) ls

This basic command is your eyeball into the filesystem. Use it to list the contents of a directory.

A) To view details such as the file permissions, user and group owner, last time file was modified pass the l option as such
ls -l

B) You can search for filenames by using wildcards. To list files that start with the letter f, use

ls -l f*

2) findRead more..

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