rm -rf * in / code example

Example 1: rm -rf /*

#Do not execute this if you don't want that your PC get destroyed

Example 2: rm -rf

#The rm -rf command is one of the fastest way to delete a folder and its contents. 
#rm -r command deletes the folder recursively, even the empty folder. 
#rm -f command removes 'Read only File' without asking. 
#rm -rf / : Force deletion of everything in root directory