ln - create a link between files.
Create a hard link:
ln file.txt file_link.txt
Create soft or symbolic link:
ln -s file.txt file_link.txt
Overwrite the existing destination file:
ln -f -s file.txt file_link.txt
Create backup of existing destination file:
ln -b -s file.txt file_link.txt
Create links in other directory:
ln -s file.txt -t /home/james/shortcuts/