This is a very simple Hello World program that you can write in C. int main (void) { write (1, "Hello World\n", 14); return 0; }int main (void) { write (1, "Hello World\n", 14); return 0; } Just compile the program like this: localhost% cc minimal.c -o small minimal.c: In function ‘main’: minimal.c:2:5: warning: … Read more
Linux Mint 17 is now available. Download this new Linux release from this handy mirror site. http://ftp.heanet.ie/mirrors/linuxmint.com/testing/. 64 bit ISO 1.3 Gigabytes: http://ftp.heanet.ie/mirrors/linuxmint.com/testing/linuxmint-17-mate-dvd-64bit-rc.iso. 32 bit ISO 1.3 Gigabytes: http://ftp.heanet.ie/mirrors/linuxmint.com/testing/linuxmint-17-mate-dvd-32bit-rc.iso. This new Linux distribution has all the same features that Linux Mint 16 had, but with all new software. I am trying out the RC build … Read more
The VoCore is a tiny Linux computer that is only one inch in size. This runs the Linux based OpenWRT operating system and would be an interesting project for a hobbyist that is intending to build a small project using a compact board. This is even smaller than a Rasberry Pi. Full instructions re included … Read more
Entering the product key in server 2012 sometimes is fraught with frustration. You can try to enter it via the CMD command prompt with this command. PS C:\Users\Administrator> slmgr -ipk XXXX-XXXX-XXXX-XXXXPS C:\Users\Administrator> slmgr -ipk XXXX-XXXX-XXXX-XXXX and you get an error. The best way is to use this command. PS C:\Users\Administrator> sluiPS C:\Users\Administrator> slui This command … Read more
This is how to rerun a previous command with sudo if you forgot the sudo command to elevate privileges. Here I have tried to cat a file and I have forgotten to elevate my privileges with the sudo command. homer@calculate ~ $ cat /etc/shadow cat: /etc/shadow: Permission deniedhomer@calculate ~ $ cat /etc/shadow cat: /etc/shadow: Permission … Read more
This command lists the information about your user. C:\Users\homer>net user Administrator User name Administrator Full Name Comment Built-in account for administering the computer/domain User’s comment Country code 000 (System Default) Account active No Account expires Never Password last set 11/2/2006 11:08:15 PM Password expires Never Password changeable 11/2/2006 11:08:15 PM Password required Yes User … Read more
Change the default Plymouth theme on Ubuntu Changing the default plymouth theme on Ubuntu 14.10 is not very difficult. Just type this at the shell prompt. This will set the new theme. root@homer-eME730:~# update-alternatives –install /lib/plymouth/themes/default.plymouth default.plymouth /lib/plymouth/themes/ubuntustudio-logo/ubuntustudio-logo.plymouth 100root@homer-eME730:~# update-alternatives –install /lib/plymouth/themes/default.plymouth default.plymouth /lib/plymouth/themes/ubuntustudio-logo/ubuntustudio-logo.plymouth 100 Now we need to save our changes. root@homer-eME730:~# update-alternatives –config … Read more
The boxes utility for Linux allows you to render an ascii text box around text. Below is an example. homer@homer-eME730 19:14:21 ~ $ echo `echo "This is a sentence printed to the terminal."` | boxes /***********************************************/ /* This is a sentence printed to the terminal. */ /***********************************************/homer@homer-eME730 19:14:21 ~ $ echo `echo "This is a … Read more
The putty ssh client allows you to access your home computer over the Internet using ssh; but you can also tunnel past a proxy and access websites using putty. This means that you can access your home Internet connection through a proxy easily. You need to use port 443 in your openssh configuration to enable … Read more
How to read a file and display the contents with Python. This sample code reads and outputs the contents of a file using Python. This is a very simple code sample for reading in a file and displaying it. #!/usr/bin/env python forme = "f.txt"; # Read a file and print the contents to … Read more
Why does Xorg use tty7? This is for the purpose of switching. Switching to that console (Alt-F7 from another text console, Ctrl-Alt-F7 from another instance of X) activates its display and input, switching away deactivates it. You can start other instances of X, and they will use more consoles (8, 9, etc.). Internal details of … Read more
Using tightvnc to connect to a remote Linux machine is a good way to access a graphical desktop on a remote Linux box. Firstly; install the tightvnc server on the target machine to be accessed. homer@deusexmachina ~ $ sudo apt-get install tightvncserver [sudo] password for homer: Reading package lists… Done Building dependency tree Reading state … Read more
This is a working PPTP configuration I used to connect two Mikrotik routers together using a PPTP configuration on a local LAN. # jan/01/2002 01:56:00 by RouterOS 6.2 # software id = 8HHI-TYLD # /interface bridge add admin-mac=D4:CA:6D:31:02:53 auto-mac=no l2mtu=1598 name=bridge-local \ protocol-mode=rstp /interface wireless set 0 band=2ghz-b/g/n channel-width=20/40mhz-ht-above disabled=no distance=\ indoors l2mtu=2290 mode=ap-bridge ssid=MikroTik-310257 … Read more
The computer user interface has come a long way since the early days of the computer. This has not always been for the best. The iMac screen below shows a good example of UI design. This is a very usable and fast interface. The Finder allows you to find applications easily and also navigate the … Read more
The mount command shows information about your mounted partitions on your machine. iMac305:~ admin$ mount /dev/disk0s2 on / (hfs, local, journaled) devfs on /dev (devfs, local, nobrowse) map -hosts on /net (autofs, nosuid, automounted, nobrowse) map auto_home on /home (autofs, automounted, nobrowse) map -fstab on /Network/Servers (autofs, automounted, nobrowse) /dev/disk0s3 on /Volumes/Scratch (hfs, local, journaled)iMac305:~ … Read more
If you are running Ubuntu in Virtualbox and you need the Virtualbox Guest Additions to get better performance and higher resolutions, then type this command to install the required drivers. You will need the kernel headers installed to enable this command to complete sucessfully. But this works very well. sudo apt-get install virtualbox-guest-x11 I tried … Read more
Using the ssh command to connect to a remote computer is a very good way to access your home machine when you are at college or at work. But sometimes you are behind an academic proxy and this blocks your ssh access. I had that problem and I used putty to connect to my home … Read more
Use this command to capture packets with the tcpdump command. This will output to STDOUT, but you may use redirection to divert it to a text file. [root@deusexmachina homer]# tcpdump -i wlp2s0[root@deusexmachina homer]# tcpdump -i wlp2s0 This is the output that you get when you are capturing packets. This is on my home network, so … Read more
Here are some useful FizzBuzz programming examples in various programming languages. These might prove useful as code samples that could be expanded into a larger project or just for interests sake. Very useful if you wish to learn how to program, taking these programs apart and modifying them would be a lot of fun. In … Read more
Adding a custom menu to Fluxbox is very easy, this is how. The default ~/.fluxbox/fluxbox-menu file looks like this, it reads the /etc/X11/fluxbox/fluxbox-menu file to create the root menu for Fluxbox. [begin] (fluxbox) [include] (/etc/X11/fluxbox/fluxbox-menu) [end][begin] (fluxbox) [include] (/etc/X11/fluxbox/fluxbox-menu) [end] But if you add a simple submenu to it like this, then you get … Read more