sh, bash, dash and Ubuntu

Posted on by
2

Hi!
I wanted to install a quite old package in my ubuntu computer using the .sh file I downloaded from their website. So, I tried typing in terminal:

sudo ./package_name.sh

and I got:

/bin/sh: 0: Can’t open ./package_name.sh

Briliant! Since you are here, you are probably looking for a fix.

The problem stems from the fact that Ubuntu uses dash as the default shell and your script is written with another shell in mind. The most usual is bash (sh).

So type in a terminal window:

sudo bash ./package_name.sh

This will force ubuntu to run the script using bash.

Enjoy!
Vasilis

PSAD Quick Fix

Posted on by
Reply

I like psad. I use it often and I find the email reports really handy.

Here is an issue I faced in Ubuntu and the solution:

Instead of the reports I received an email with the following contents:

[-] You may just need to add a default logging rule to the /sbin/iptables
‘filter’ ‘INPUT’ chain on oxide-server.  For more information,
see the file “FW_HELP” in the psad sources directory or visit:

http://www.cipherdyne.org/psad/docs/fwconfig.html

[-] You may just need to add a default logging rule to the /sbin/ip6tables
‘filter’ ‘INPUT’ chain on oxide-server.  For more information,
see the file “FW_HELP” in the psad sources directory or visit:

http://www.cipherdyne.org/psad/docs/fwconfig.html

 

I found on the web several people with the same problem, so here is what worked for me:

  1. Enable ufw logging. Type in console as root: ufw logging on
  2. Type as root:
    iptables -A INPUT -j LOG
    iptables -A FORWARD -j LOG
    ip6tables -A INPUT -j LOG
    ip6tables -A FORWARD -j LOG
  3. Open /etc/ufw/before.rules and type before the COMMIT directive:
    -A INPUT -j LOG
    -A FORWARD -j LOG
  4. Open /etc/ufw/before6.rules and type before the COMMIT directive:
    -A INPUT -j LOG
    -A FORWARD -j LOG
  5. Restart ufw by typing as root:
    ufw disable
    ufw enable
  6. Test if it worked:
    psad –fw-analyze

I know that some parts appear to do very similar things but for a strange reason it worked only after the exact above procedure.

Hope it helps!
Vasilis

 

 

SWikipedia: S (named ess spelled ‘es’- in compound words; plural esses, forms/script: ) is the nineteenth (19th) letter in the ISO basic Latin alphabet. →

Image resize & JPG to PDF

Posted on by
1

I am preparing some applications and I needed to scan several documents and upload them online in PDF format. The problem is that there is an upload limit of 3MB per PDF document. Since I like to have my files well organized and maintain digital records for everything I always use the maximum resolution (600dpi) when scanning. This, of course, results in 5-6 MB images.

So, I had to resize multiple JPG documents and then combine them in 6-7 pdf files.

The tools I found extremely handy for this purpose were:

  • FastStone Photo Resizer: For resizing multiple files in a fraction of their original size. Worked like a charm! (http://www.faststone.org/FSResizerDetail.htm)
  • FM JPG To PDF Free: For combining the images to a single PDF. Pay close attention (as always?) when installing the application and uncheck the installation of unnecessary features like “Babylon search”, unless you really like them. (http://www.fm-pdf.com/FM-JPG-To-PDF-Converter-Free-Setup.exe)

From this point the procedure was easy an it was more drag n’ drop.

Let me know if you are aware of better alternatives!

Have fun!
Vasilis

P.S.: Maybe next time I should try using a loseless image format, like PNG, instead of JPG.

I’m back!

Posted on by
Reply

Hi everyone!

I am back from Germany where I worked as an intern in Deutsche Bank.

It was a delightful experience and I am more than happy I accepted the offer!
I presented my thesis about two weeks ago and I am currently working on other things.

The last 8-9 months I have been experimenting with OpenWRT and other alternative OSes for embedded devices and I have some nice projects in mind! Stay tuned for more!

Best wishes,
Vasilis