Ubuntu: Recent command history (terminal)

Hello guys,
In this post I'm gonna show you "How to display and play with a list of recent commands in Ubuntu?".
To check history of command or to get info about command executed by user, we can use the following command:

history

It will display the list of all the command executed, along with a serial number indiacating the oerder in which they are executed.

Now you may feel it dificult to find a specific command among them. In order to do so, we can combine the history with grep.

history | grep version

This will display a list of command in which the word "version" has appeared.

We can also execute a specific command by knowing its serial number from this list. After getting the result from history command, just type the number preceeded by ! to execute the command. To execute command which is at number 115 in the list, just type

!115

It will run the 115th command in the history list.

To re-run a recent command that starts with xyz, just type !xyz.

!histo

It may display the recent history, if no other command would have been executed after recent history command.

And the most commonly used reverse search:

Ctrl + R

After typing this command, type a keyword to search. When you found your command, just press enter.

Ubuntu: Access a usb flash drive from the terminal

1. Find what the drive is called You'll need to know what the drive is called to mount it. To do that fire off: sudo fdisk -l You're looking for a partition that should look something like: /dev/sdb1 . Remember what it's called. 2. Create a mount point Create a new directory in /media so you can mount the drive onto the filesystem: sudo mkdir /media/usb 3. Mount! sudo mount /dev/sdb1 /media/usb When you're done, just fire off: sudo umount /media/usb Source: StackOverflow

Code for Php based online Treasure Hunt

Hello guys. Some time back I organized an online treasure hunt as part of an event at my college. I thought of sharing the code with you, as you might find it useful. So, I uploaded it on github and here is the link to my repository. Download it from here , and enjoy organizing the game

Java: Use BigInteger in for-loop

In my previous post , I mentioned a way to handle large integers by using BigInteger. Now I'm going to provide a very important usage of it. We often use for-loop. So here is the way to use it: Ordinary integers: for(int i = 1; i <= n; i++) { //Task to do } BigInteger: for (BigInteger bi = BigInteger.valueOf(1); bi.compareTo(n) <= 0; bi = bi.add(BigInteger.ONE)) { //Task to do } here n is a BigInteger variable.

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