How to find file and directory size in Unix with Example - Linux tutorial

How to find the size of a directory in UNIX
Finding file size or directory size in Unix and Linux is not very difficult but if you came from windows background than it may sound difficult to you because you need to remember UNIX commands for file and directory size. This is a common complaint from windows users when they exposed to Unix operating system be it Linux or Solaris. but In my opinion, having commands for doing things is more powerful because you can write powerful scripts for removing large files or taking backup of directories in UNIX which is not possible with GUI based operating systems like Windows.
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