Linux : How to copy/remove all files from a tree of directories.

Sometimes we face a situation when there are a huge or rather say a deep tree of directories. All these directories in turn contains directories and files and at the leaf node i.e. in the innermost directory there are some files.
Now you want to copy all files at one place or say you want to perform some action on all these or some selected files.

How to remove Ubutnu if installed on seperate partition (Dual Boot system)

If you have installed Linux on its own partition in a dual-boot configuration, there’s no easy uninstaller that will remove it for you. You will need to delete its partitions and repair the Windows boot loader on your own.
To remove the Ubuntu from your system, follow these steps.

Deleting Linux Partition.

Checking RAM size , Usage in Ubuntu

To check the RAM usage in Ubuntu , there are these two(out of many others) methods -

1. use command

$ cat /proc/meminfo