Saturday, June 15, 2013

Erlang on Linux: Configuration and Installation

Erlang is a fast growing language and is used in many key applications. Being concurrent and is used in many applications where multiple service are required simultaneously. 
It can be installed on linux via it package 
simply from the terminal using : sudo apt-get install erlang

I did using the source file from the erlang site.
The following steps made me complete the installation:

1>download the tar file.
2> cd to the folder and unzip it.
3> go the unzipped folder.
4> Now, Erlang needs some other files to fully complete installations and generate documentations.
  So the following steps needs to be done:
  • sudo apt­-get install fop 
  • sudo apt­-get install libncurses-5­-dev
  • sudo apt­-get install openjdk­6­-jdk
  • sudo apt­-get install unixodbc-­dev
  • sudo apt­-get install g++
  • sudo apt­-get install libssl­-dev
Still, Erlang requires wx libraries so we will do the following:
  • sudo apt­-get install libwxbase2.8
  • sudo apt­-get install libwxgtk2.8­dev
  • sudo apt­-get install libqt4­opengl­dev
  • sudo apt­-get install libgtk2.0­dev
Now, we are ready to go...
  1. cd to unzipped folder.
  2. Type: ./configure
  3. Type: make
  4. Type: sudo make install
And there it will be....your Erlang ready to goo....
Test it by typing in the terminal..
It will print: 11
which erl
This is supposed to give : /usr/local/bin/erl
....So happy coding...Cheers...

...If there is any problem...let me know.. lets solve it together...

Friday, June 14, 2013

Boot problem in Ubuntu dual boot os: Solved

I had been using Ubuntu for quite a long time. Sometimes, problems arise as such like:
  •  Windows cannot boot.
  • or Ubuntu cannot boot.
Solving this problem is easy: however it requires you to have:
  • Internet connection.
  • Ubuntu live cd or bootable pendrive.
Now lets go through how we could solve this using a software:
  1. Boot from the pendrive or cd.
  2. Use the Try Ubuntu mode on first page.
  3. Connect to the net
  4. Open the terminal using ctrl+alt+t and do the following steps:
  • sudo add-apt-repository ppa:yannubuntu/boot-repair
  • sudo apt-get update
  • sudo apt-get install -y boot-repair && (boot-repair &)
Now a window will pop up after installation and it will give you the options. Choose whichever is appropriate and it will solve the problem.
It also provides link to the error log file from where you can know more of the problem or ask the community about it.

.......So don't worry next time...just do the steps listed above...If it does not solve ...leave a comment here..lets see to it..

How to create a bootable USB pendrive in Linux

If it was windows, it would be much easier ...for we have the universal USB installer. In Linux, we can't use that: however, we need not worry, guys have done a great job by creating a much easier tool to do the work.

The tool is called gparted. It is a nice GUI tool to do our work. So lets see how we shall do it.

>Open the terminal .

>Now type: sudo apt-get install gparted
......This will install the tool ...well and good if you had it from before.

>Now type: sudo apt-get install-3g( gparted installed this as default for me...just see if it did for you).

>Now open the tool via: System>Administration>Gparted Partition Tool

>Now you are almost done....Click the File and choose the drive for the particular USB.

>Right click on the drive when it is enlisted. See Manage Flag menu and click to enable boot.

>Now go to Partition menu at the top panel and format the drive as ntfs . This will keep the work as pending operation the correct sign above to start the operation...It will be done in a moment..

>Just  unplug and plug in the pendrive once and do the last step.

> Now you can just decompress the win7.iso file to your pendrive ...and it is bootable right away..

Wednesday, June 5, 2013

How to find the difference between two files from windows shell

Well I was just wondering how could I see the difference between two files in windows.
Searching the net, I saw some softwares  that would do the job for me..But I wanted simple and fast not so sophisticated ...

I found out we could do using a simple tool...fc..from the DOS prompt.
FC is a command to view the difference of two files or set of files..
So the steps are:
1> go the directory where the files are..
 fc first-filename second-filename
....and there you go..You will get the result each different section divided by line of stars..
...Its simple ...right??
I love it....The following explains the full usage method

FC [d:][path]filename [d:][path]filename [/A][/C][/L][/Lb n] [/N][/T][/W][/(number)]

for binary comparisons
FC [d:][path]filename [d:][path]filename [/B][/number] 

FC reports differences between the two files you specify. FC first displays the name of the first file to compare. Next, it displays the lines that differ between the two files. Next, it displays the first line that matches in the two files. FC next displays the name of the second file, followed by the lines that are different followed by the first line that matches.

The FC command requires enough system memory (RAM) to compare 100 lines. If system memory is limited, FC will make comparisons between the number of lines that can fit into available memory. Be careful of this!.


- Instead of displaying all the lines that do not match (in an ASCII comparison), the program displays only the lines that begin and end each set of differences.

/B - Used for a binary comparison of files. The files are compared byte-by-byte. Mismatches are displayed as a relative address from the beginning of the file. Unless you specify the /L switch, the program will automatically assume you want to use this type of comparison when the compared files have a .COM, .EXE, .SYS, .BIN, .OBJ, or .LIB filename extension.

/C - Ignores the case of letters in the compared files. All letters are considered as upper case.

/L - Used for an ASCII comparison of files. Unless you specify the /B switch, the program will automatically assume you want to use this type of comparison for all files that do not have a .COM, .EXE, .SYS, .BIN, .OBJ, or .LIB filename extension.

/Lbn - Sets the line buffer to n number of lines. The amount of memory used for holding lines being compared is normally enough to store about 100 lines. Use this option to reset the buffer (memory space) to n lines. If more than this number of consecutive lines is found to differ, the program will terminate the comparison and display an error message.

/N - Used to turn on the display of line numbers while carrying out an ASCII comparison.

/T - Turn off the display of tabs as spaces in an eight column display format.

/W - Compresses tabs and spaces during the comparison.

/(number) - The number of lines that must match after the program finds a difference between the compared files (if fewer lines match, the matching lines are displayed as differences). If you do not use this option, the number of lines to match between the files is two.


To compare the text file A.html with the file B.html on drive D 

 type and press return key the following..

fc /l A.html D:B.html
for binary comparison of the files A.EXE and B.EXE, enter
fc /b B.exe A.exe

.....................................I hope this helps..
way to gooo...

GIT : Terminal help you..and us..


Ctrl + AGo to the beginning of the line you are currently typing on
Ctrl + EGo to the end of the line you are currently typing on
Ctrl + LClears the Screen
Command + KClears the Screen
Ctrl + UClears the line before the cursor position. If you are at the end of the line, clears the entire line.
Ctrl + HSame as backspace
Ctrl + RLets you search through previously used commands
Ctrl + CKill whatever you are running
Ctrl + DExit the current shell
Ctrl + ZPuts whatever you are running into a suspended background process. fg restores it.
Ctrl + WDelete the word before the cursor
Ctrl + KClear the line after the cursor
Ctrl + TSwap the last two characters before the cursor
Esc + TSwap the last two words before the cursor
Alt + FMove cursor forward one word on the current line
Alt + BMove cursor backward one word on the current line
TabAuto-complete files and folder names


cdHome directory
cd [folder]Change directory
cd ~Home directory, e.g. ‘cd ~/folder/’
cd /Root of drive
lsShort listing
ls -lLong listing
ls -aListing incl. hidden files
ls -lhLong listing with Human readable file sizes
ls -REntire content of folder recursively
sudo [command]Run command with the security privileges of the superuser (Super User DO)
open [file]Opens a file ( as if you double clicked it )
topDisplays active processes. Press q to quit
nano [file]Opens the Terminal it’s editor
pico [file]Opens the Terminal it’s editor
clearClear screen


history nShows the stuff typed – add a number to limit the last n items
ctrl-rInteractively search through previously typed commands
![value]Execute the last command typed that starts with ‘value’
!!Execute the last command typed


touch [file]Create new file
pwdFull path to working directory
..Parent/enclosing directory, e.g.
‘ls -l ..’ = Long listing of parent directory
‘cd ../../’ = Move 2 levels up
.Current folder
catConcatenate to screen
rm [file]Remove a file, e.g. rm [file] [file]
rm -i [file]Remove with confirmation
rm -r [dir]Remove a directory and contents
rm -f [file]Force removal without confirmation
rm -i [file]Will display prompt before
cp [file] [newfile]Copy file to file
cp [file] [dir]Copy file to directory
mv [file] [new filename]Move/Rename, e.g. mv -v [file] [dir]


mkdir [dir]Create new directory
mkdir -p [dir]/[dir]Create nested directories
rmdir [dir]Remove directory ( only operates on empty directories )
rm -R [dir]Remove directory and contents

PIPES – Allows to combine multiple commands that generate output

moreOutput content delivered in screensize chunks
> [file]Push output to file, keep in mind it will get overwritten
>> [file]Append output to existing file
<Tell command to read content from a fi


[command] -hOffers help
[command] —helpOffers help
[command] helpOffers help
resetResets the terminal display
man [command]Show the help for ‘command’
whatis [command]Gives a one-line description of ‘command’

Macbuntu theme destroyed my Ubuntu

I have been using Linux on my PC using dual boot. This time I was using Ubuntu 11.10 ultimate edition. 
As like many windows users ..I have been tempted my Mac-OS..and I have been using Mac theme for my PC too..
Recently I got too ambitious and I went on to install Macbuntu theme for my Linux ...(I thought I could be satisfied than I did on my windows)...Lo....During installation ...It got too complex...many downloads...and that too ...unverified.....
After it was half way through ..the system tray could be seen...but it was not functioning at all...
.....It was going too frustrating I did a force shut down...(It was the last time I could see my GUI ...)...After this, I could never go back to the gui...All it was left was the tty..(and what much could we do in there..??)..
I am careful now..I won't install any theme again...  

Tuesday, June 4, 2013

Linking to a hosted Cloud JQuery library is better than localized link: The Reasons

Well, we all know what and how JQuery has revolutionized the UI design and development of websites and web applications. Given its robustness for browser support, familiar syntax ,built-in animations and  not impact content gives it immense credibility and avenues for use in many great applications..
In its development novice developers sometimes makes the mistake of linking the lib from their own local site..However this is wrong ..which I can say confidently at least for the case of deployment of your app.
The reason is:

Using Cloud Scripts Keeps Your Pages Fast
Linking to script libraries such as jQuery from an internet location
 (such as in the HTML here) is a way of using a content delivery network (CDN). When many developers link to the same location for
a script, that script is more likely to be cached by your readers and load more
quickly. Also, your browser may have a limit of as few as two connections to a
specific host name at once, so this sends a request to a separate domain,
increasing the speed.

As jQuery's popularity has grown, companies have made the file freely available
through their Content Delivery Networks (CDNs). 
Most notably:
 Google : link
 and Microsoft : link 
 offer the file on powerful, low-latency servers distributed around the world for fast download regardless of the user's location
..................................................If you just trying for local development could have it in your own machine...maybe..that will save when you don't have net connection... happy coding...and cheers..
way to goo..