Creates links to files and directories.
# To create a symbolic link to a file or directory:
ln -s <path/to/file_or_directory> <path/to/symlink>
# To overwrite an existing symbolic link to point to a different file:
ln -sf <path/to/new_file> <path/to/symlink>
# To create a hard link to a file:
ln <path/to/file> <path/to/hardlink>