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Pages with category Unix

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  • Well... I knew that a firewall could generate a few problems, but this one, I did not expect!

    I just could not FTP anything from my FedoraCore box. I checked the source system firewall, tweaked all sorts of options in the vsftpd.conf file to no aval.

    The error I was getting was this:

  • [vtoc title=Boot Sector; minlevel=1; maxlevel=4;]

    Error 16

    Today I got an error 16 with GRUB on one of my machines. This had happened before so I did not worry too much. It is just quite annoying.

    Ubuntu CD

    A Ubuntu boot CD has a cool feature one can use to rescue such a system (i.e. re-install GRUB properly.) More or less, boot the CD, select the rescue mode, let it do its things for a moment (after you select options like keyboard, etc.)

  • Earlz found a way to hack the NVG510 device and wrote a page about it: Rooting The NVG510 from the WebUI

    He also offers a page that one can use to allow telnet connections to the NVG510 (by default it is locked up.) From there you can allow ssh and tftp connections too.

    Note that this means if you are logged in your NVG510 and you click on a link on a bad server, you could actually allow remote connections from anyone! So that's a dangerous back door, although if you are not logged in the Web interface, then it is fine (assuming you do not then log in without thinking!?)

    Just in case ...

  • Ubuntu (and Debian) come with many "alternatives".

    The system offers many editors, browsers, compilers, shells, etc. Just have a look at the large selection under /etc/alternatives.

    ls /etc/alternatives
    

    Under Unix, one can create soft links to soft links to soft links to an actual file. The alternatives work in that way. The soft links defined in the /etc/alternatives folder are pointers that one can change to make his/her system more likeable.

    To change one of these alternatives, Ubuntu offers the update-alternatives script. For example, if you don't like Nano, change your

  • Ever wondered whether you could ask bash auto-complete to ignore some of your files?

    You can with the FIGNORE feature and the bind feature:

    export FIGNORE=CVS:\~:.o:.svn
    bind 'set match-hidden-files off'

    You had one or both of these lines to your .bashrc file and then the .svn and CVS folders won't be used anymore! Add all the extensions you don't like in there and you'll feel better soon!

    Note: The \ in front of ~ is to avoid the bash expansion of that character.

  • Getting the OS

    First go to http://www.ubuntu.com and get the latest version you're interesting in. They offer server version that they support for 5 years or so. I suggest one of those if you want to run a server. This is an ISO, in generate around 600Mb so be ready to wait a few hours... Even with a really fast connection, because the transfer will be limited by the mirror in most cases.

    WARNING
    Unless you know better, I strongly suggest you get the Ubuntu Server version. Maybe a bit more annoying to use BUT it works on ALL computers. And ...
  • Well, first... what is RAID?

    Loads of very detailed info are available on Wikipedia. Just in case, it means: Redundant Array of Independent Disks.

  • Now a day I like to install Solaris to check that my code compiles and generally runs under that OS.

    I think that's a good way to prove that the code is multi-OS ready even if it is only for Unices.

    OpenSolaris is free and can be downloaded from Oracle. The last URL I use was:

    http://www.oracle.com/technetwork/server-storage/solaris11/downloads/index.html

    The system, by default, comes with a directory named /usr/sfw which includes a really old version of gcc. It is possible, though, to move forward with a newer version of the compiler by installing a package. Under Solaris 11.2, this ...

  • If you were wondering how to make MS-Windows know about your Intranet computers, let me tell you, it's very simple, you just have to add the address(es) to your hosts file. Am I kidding?! Yeah! Right! Have a look for yourself, on NT and Windows 2000, XP, 2003, Vista, etc. you have a "network driver"1 here:

    • 1. For your information, the network stack comes from FreeBSD. That additional module you bought for $100+ for MS-DOS and then MS-Windows 1.0 to 3.1... was free software.
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  • nop

    nop is the usual abbreviation for the No Operation command often used in assembly language (processor code.) Some times, it is written as noop instead.

  • plugin
  • sector
  • sha256
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