Find text in linux files

To check if a given package is installed in Debian / Ubuntu, type

dpkg -s <package-name>

To get a neater output use dpkg-query which accepts wildcards as well.

dpkg-query -l <package-name>

In Redhat / Fedora / CentOS use the foll...

For Chromium browser versions greater than 34, to use flash one must install Pepper flash.

For Ubuntu 14.04 or newer, run

sudo apt-get install pepperflashplugin-nonfree
sudo update-pepperflashplugin-nonfree --status 
# to see what version of...

The extend method will mix a module’s methods at the class level.

On the other hand, the include method will mix a module’s methods at the instance level, meaning the methods will become instance methods of the class.

module Stringify
  # R...

This is to install adobe flash player in Ubuntu 14.04 or higher. This works for Firefox browser.

If you have a 32-bit OS, run

sudo apt-get update
sudo apt-get install flashplugin-installer

Make sure each of the commands executed success...

I've noticed that Incognito mode retain cache from the previous session, it just don't collect any new cache while in incognito.

I usually clear the cache/cookies then go into incognito, or run a different browser profile, or a different browser ...

In linux, we often see the use of ./ or ../ before a file name. Here is the explanation for the same

.  Current Directory
.. Parent Directory

./filename  # referring to file name in current directory
../filename # referring to file name in p...

when the file names were actually in japaneese, IE by default will not converting the links from Japanese text to unicode URL format i.e %20. Here is the fix that required

<a href="<%= product.product_image.url) %> ">SOME FILE NAME</a>
CHANGE...

class Person    
    def initialize(name)
        @name = name
    end    
end

class Employee < Person
end

emp = Employee.new # throws error wrong number of arguments

emp = Employee.new("foo") # parent class initialize method is called

cla...

As we have object.class method in Ruby, to check the class of a variable in Javascript, here is the snippet

var ss = "some string";
alert (typeof ss);  #=> string
alert (typeof pp);  #=> undefined

After installing sublime text, we must be able to open text files with it. Right click on a text file and you must see the option "open with sublime text". In case you don't , click Open with other applications and you should see Sublime text opti...