Category Archives: TechTips

Generating Password and OTP in Java

You may go through Generate a One Time Password or Unique Identification URL article before this for better understanding. Many a times we forget our passwords and we opt for Forget password option and within no time we get a new password at our registered email-ID or phone no. to login our account. And every… Read More »

How to overcome Time Limit Exceed(TLE)?

Many programmers always argue that the problems in Competitive Programming always end up with TLE(Time Limit Exceed). The Main problem of this error is that it will not allow you to know that your solution would reach to correct solution or not! Why TLE comes? Online Judge Restrictions: TLE comes because the Online judge have… Read More »

Terminal Mail and Linux Security Mail

While working on Eudyptula Challenge, I was needed to mail them the tasks in the plain text format, since the server rejects all the HTML mails it receives due to security reasons. So I started mailing them from terminal which is quite simple to configure and very fast. HTML vs Plain text Mail Actually the… Read More »

Whatsapp using Python!

Have you ever wished to automatically wish your friends on their birthdays, or send a set of messages to your friend ( or any Whastapp contact! ) automatically at a pre-set time, or send your friends by sending thousands of random text on whatsapp! Using Browser Automation you can do all of it and much… Read More »

Useful CMD commands for daily use in Windows OS

List of uncommon useful cmd commands are as follows: Cipher: Cipher.exe is a built-in command line tool in the Windows operating system that can be used to encrypt or decrypt data on NTFS drives. This tool also lets to securely delete data by overwriting it. Cipher Switches: /? : Displays help at the command prompt.… Read More »

Send message to FB friend using Python

The power of Python comes because of the large number of modules it has. This time we are going to use one of those. Everyone of us, one time or another, has a wish of messaging (or spamming -.-) our Facebook friend. This is a program which can do something similar. So without further delay,… Read More »

Linux Virtualization – Chroot Jail

What is a chroot Jail? A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children. The programs that run in this modified environment cannot access the files outside the designated directory tree. This essentially limits their access to a directory tree and… Read More »

How to download Youtube videos?

Open your desired video. Add “ss” to URL of your video in youtube. For example, if URL of your youtube video is, then new URL becomes Your browser would open, clock the download button. This article is contributed by Abhishek. If you like GeeksforGeeks and would like to contribute, you can also… Read More »