how to delete all directories in a directory bash code example

Example 1: remove all files inside directory linux

# remove everything in a directory 
rm /path/to/dir/*
# remove all sub-directories and files
rm -r /path/to/dir/*

Example 2: ubuntu delete contents of folder

To remove all non-hidden files and sub-directories (along with all of their contents) in a 
directory use:
rm -r /path/to/directory/*