how to delete a file using command line in ubuntu code example

Example 1: remove file from terminal ubuntu

//in admin folder must be terminal in as root
for root type
$ sudo su
//to remove file 
//as example

rm -f /usr/bin/node

Example 2: remove a file in ubuntu

=> To delete a single file:
unlink filename
rm filename

=> To delete multiple files at once
rm filename1 filename2 filename3
rm *.pdf