how to remove all the files in a directory in linux code example

Example 1: delete all the files without one in linux

# delete all except the filename

$ rm -v !("filename")

Example 2: 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 3: ubuntu delete directory and all files

rm -rf ./test

Example 4: remove a file or dir in linux or mac or ubuntu

note:your_file_name can be a dir or a file 

sudo rm -r your_file_name