CentOS rescue mode

After a power outage somehow my server is not finding the boot partition anymore. As far as I read about recovering a CentOS 6.4 I just need to pick "Rescue installed system" option from the boot menu.

But where is the "Rescue installed system" on the boot menu?

I had boot from the same liveCD which the original installation was done. But there's no option like that. I even tried to type "linux rescue" on boot command line, no success so far. It did not find the kernel image.

Seens to be so simple task, but I given up... Thanks in advance!

What to do for resolveip output the domain name

What I must have do to I can use resolveip (on any machine connected on internet) and get the output:

Host name of xxx.xxx.xxx.xxx is mydomaing.com

and not

resolveip: Unable to find hostname for xxx.xxx.xxx.xxx

List the files of another format while finding a certain name pattern

I had wanted to edit the txt files of videoA and videoB only if the movs files names contains the namespace -test

For eg.

videoDir
    |-videoA
        |- videoA_v001_test.mov
        |- videoA_v001_info.txt
    |-videoB
        |- videoB_v001_test.mov
        |- videoB_v001_info.txt
    |-videoC
        |- videoC_v002.mov
        |- videoC_v002_info.txt

Above, I want to edit videoDir/videoA/videoA_v001_info.txt and videoDir/videoB/videoB_v001_info.txt but not videoC_v002_info.txt since the corresponding .mov file name doesn't contain test.

I come up with the command - find -name "*.mov" | grep -rn "test" | find -name "*.txt", find -name "*.mov" | grep -rn "test" does indeed lists out the 2 files that fulfills the condition (videoA and videoB). I added infind -name "*.txt"` as I had thought it will filter it down to the txt files within the output results, however I was wrong as it is still listing all the txt files

Crunchbang: Can't use simple-scan without administrator rights

I'm running the latest version of Crunchbang 64-bit on a Dell E5510 notebook.

Installing my printer and scanner worked fine - I just used an existing Ubuntu tutorial. However, scanning without starting Simple-Scan as sudo produces an error message. My main account is listed as part of the group scanner, according to the output of less /etc/group. To my limited knowledge, this should suffice, shouldn't it? What more steps are necessary in order to run simple-scan without sudo?

Thanks in advance.

Can I do reverse traceroute?

Is it possible to do reverse traceroute ? This is very important for me to know, Why the websites are loading slow for my clients in certain area ?

Writing a program for editing .txt data - Python or Unix?

I only have little experience in programming, and I'm currently working on improving my skills. Basically, I need to write a program, that can do some specific processes to some data in a .txt file.

To start from scratch, I have a .txt file with data looking like this:

>tex_1 abcdefghijklmnopqrstu
>tex_2 abcdefghijklmnopqrstuv
>tex_3 abcdefghijklmnopqrstuv
>tex_4 abcdefghijklmnopqrst
//     x
>tex_1 abcdefghijklmnopqrstu
>tex_2 abcdefghijklmnopqrstuv
>tex_3 abcdefghijklmnopqrst
>tex_4 abcdefghijklmnopqrstuv
//         x  x
>tex_1 abcdefghijklmnopqrstuv
>tex_2 abcdefghijklmnopqrstuv
//     x   x

I need to do some weird stuff to this data, in order to end up with a data set, that can be analyzed in the software I use. Each "//..."-line refers to the group of data above, until the next "//..."-line

Here's a line-up of what I want to do:

Shift the "//..."-line, so the group of data it refers to is below this line, and not above it:

//         x
>tex_1 abcdefghijklmnopqrstu
>tex_2 abcdefghijklmnopqrstuv
>tex_3 abcdefghijklmnopqrstuv
>tex_4 abcdefghijklmnopqrst
//         x  x
>tex_1 abcdefghijklmnopqrstu
>tex_2 abcdefghijklmnopqrstuv
>tex_3 abcdefghijklmnopqrst
>tex_4 abcdefghijklmnopqrstuv
//              x   x
>tex_1 abcdefghijklmnopqrstuv
>tex_2 abcdefghijklmnopqrstuv

Add a unique name to each group after //, without shifting remaining text on the line:

//Name 1  x
>tex_1 abcdefghijklmnopqrstu
>tex_2 abcdefghijklmnopqrstuv
>tex_3 abcdefghijklmnopqrstuv
>tex_4 abcdefghijklmnopqrst
//Name 2   x  x
>tex_1 abcdefghijklmnopqrstu
>tex_2 abcdefghijklmnopqrstuv
>tex_3 abcdefghijklmnopqrst
>tex_4 abcdefghijklmnopqrstuv
//Name 3        x   x
>tex_1 abcdefghijklmnopqrstuv
>tex_2 abcdefghijklmnopqrstuv

Output this to a new file, without changing the original. Then grab each name-line + line below, and output this to a File2:

//Name 1  x
>tex_1 abcdefghijklmnopqrstu
//Name 2   x  x
>tex_1 abcdefghijklmnopqrstu
//Name 3        x   x
>tex_1 abcdefghijklmnopqrstuv

Change the structure, so the naming is like the following, and output this to File3:

>Name 1 abcdefghijklmnopqrstu
>Name 2 abcdefghijklmnopqrstu
>Name 3 abcdefghijklmnopqrstuv

The above data is in a structure, I can actually analyse.

Now I know this is guite the task (especially for a complete programming-noob), and I am not asking you "how do I program this. I would just like to know, where you guys would start with such a project, and what language do you think fits the project best?

I managed to do a few things in unix, by getting help on this site. E.g. Giving unique names to each "//..." line, by the following unix code:

awk -F '' '/\/\//{n++ ; t=" Name "n ; sub("// {0,"length(t)-1"}","//"t)}{print}' File1.txt

Could you give me some hints for where to start? Is the problem suitable as a Python project? The original .txt data file contains a lot of data, so it is not possible to do the processing by hand. Also this project is meant as a way to get further into programming.

Thank you!

What port uses my backportpackage or bzr?

I am working in a company what uses Ubuntu Precise on the desktops behind a proxy. The Proxy is available in /etc/environment and set as: http_proxy, https_proxy, ftp_proxy, no proxy and their uppercase versions.

So actually i have a problem with using some applications inside the Bash. If i'm using backportpackage (like backportpackage -s trusty -d precise fop) or bzr branch then just comes up a timeout.

Now i'm guessing that the programs trying to use an unsupported (from Proxies Firewall) Port. But if i can find out what port it uses, i can ask the Admins for opening the port.

May anyone can help with this?