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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to Determine the File System Type in Linux (Ext2, Ext3 or Ext4)?
The file systems in Linux can be of different types. They support different file sizes and some mechanism like journaling etc. Also different types of file systems are supported by different Linux Kernel systems. So for the devices which are available as memory in the Linux System, we can determine their file types by using the following commands.Using lsblkThis command dispalys all the attached divices as well as their file types and partitions.$ lsblk -fRunning the above code gives us the following result −NAME FSTYPE LABEL UUID MOUNTPOINT sr0 sda ├─sda2 ├─sda5 swap 02a54ace-c5c2-41cf-a679-acd9b460ee79 [SWAP] └─sda1 ext4 ae7c051f-451b-45ad-80a3-347c70a9de5e /Using fileIt ...
Read MoreHow to Create Multiple User Accounts in Linux?
Adding a single new user to a Linux system can be achieved through the useradd command. But system admins often get request to add many users. So Linux provides a different to do a bulk addition of many users to a system.This is the newusers command.Synatxsudo newusers user_deatils.txt user_details.txt is the file containing the details of all the usernames to be added.User DetailsBelow we see the structure of user_details.txt file.UserName:Password:UID:GID:comments:HomeDirectory:UserShell So we create a file with below details to add many usres.~$ cat MoreUsers.txt uname1:pwd#@1:2112:3421:storefront:/home/uname1:/bin/bash uname3:pwd#!@3:2112:3525:backend:/home/uname3:/bin/bash uname4:pwd#$$9:9002:4721:HR:/home/uname4:/bin/bashGiving Permissions to the User Details FileBefore we sue the user details file to ...
Read MoreHow to Count Word Occurrences in a Text File using Shell Script?
Linux shell scripting has many powerful tools to process the data in files. One such feature is to find patterns and count the number of occurrences of matched patterns. One such example is to count the number of occurrences of a specific word in a given file. This is achieved by combination of commands for pattern search and counting. Below are the approaches which can be used for this need.Input fileLets use the below file for demonstrating the examples.$ cat inspire.txt Mastering anything needs practice. It also needs patience. And it needs time and other resources.Using grep and wcThe grep ...
Read MoreHow to Count Number of Files and Subdirectories inside a Given Linux Directory?
It often becomes essential to know not just the count of files in my current directory but also the count of files from all the subdirectories inside the current directory. This can be found out using theUsing lswe can use ls to list the files, then choose only the ones that start with ‘-‘ symbol. The R option along with the l option does a recursive search. The ‘-c’ option counts the number of lines which is the number of files.ls -lR . | egrep -c '^-'Running the above code gives us the following result −13Using find With Hidden FilesThe ...
Read MoreBinary Search in C++ Standard Template Library (STL)
A binary search known as logarithmic search is a search algorithm that searches for an element in a sorted array. The algorithm recursively divides the array into two halves, if the element is found at the mid position then return otherwise call the divide and check again until the element is found.WorkingThe algorithm works by comparing the middle element of the sorted array with the element that is to be searched.If the search element is equal to the middle element, then return the index of the element.If the search element is greater than the middle element, search in the left ...
Read MoreCreate Shortcuts to Long and Complicated Paths in Linux (Gogo)\\n
Gogo is a tool to bookmark directories with long and complicated paths in the Unix shell. Because the long parts are difficult to remember and cumbersome to type in. In this article we'll see how to install go go and use it.Installing gitWe first need to have git installed in our system which will be needed for gogo installation. To install git in an Ubuntu system follow the below command.$ sudo apt install gitRunning the above code gives us the following result −[sudo] password for ubuntu: Reading package lists... Done Building dependency tree Reading state information... Done The following additional ...
Read MoreHow to use case-insensitive switch-case in JavaScript?
To use case-insensitive switch-case in JavaScript, make the input all upper or all lowercase.ExampleYou can try to run the following code to learn how to use a case-insensitive switch: JavaScript Strings var str = "amit"; str = str.toUpperCase(); switch (str) { case 'AMIT': document.write("The name is AMIT "); break; case 'JOHN': document.write("The name is JOHN "); break; default: document.write("Unknown name") } document.write("Exiting switch block");
Read MoreMulti-Way Trees
A multiway tree is defined as a tree that can have more than two children. If a multiway tree can have maximum m children, then this tree is called as multiway tree of order m (or an m-way tree).As with the other trees that have been studied, the nodes in an m-way tree will be made up of m-1 key fields and pointers to children.multiway tree of order 5To make the processing of m-way trees easier some type of constraint or order will be imposed on the keys within each node, resulting in a multiway search tree of order m ...
Read MoreRebalancing Algorithms
The rebalancing Algorithms can be performed in following way −Day-Stout-Warren AlgorithmWe can implement actually rebalance method using the Day-Stout-Warren Algorithm.It's linear in the number of nodes.The following is a presentation of the basic DSW Algorithm in pseudo code.A node is allocated called as the "pseudo-root" and make the tree's actual root as the right child of the pseudo-root.Call tree-to-vine function for converting tree to sorted linked list with the pseudo-root as its argument.Call vine-to-tree function for converting sorted linked list to tree again with the pseudo-root and the size (number of elements) of the tree as its argument.The tree's actual ...
Read MoreBlocked Bloom Filter
We select a memory block first.Then we select local Bloom Filter within each block.It might cause imbalance between memory blocksThis filter is efficient, but poor false positive rate(FPR).At first instance, blocked Bloom filters should have the same FPR (False Positive Rate) as standard Bloom filters of the same size.Blocked Bloom Filter consists of a sequence of block b comparatively less than standard Bloom filters (Bloom filter blocks), each of which fits into one cache-line.Blocked Bloom filter scheme is differentiated from the partition schemes, where each bit is inserted into a different block.Blocked Bloom Filter is implemented in following ways −Bit ...
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