Create pseudonyms (links) for files, allowing them to be accessed by different names. Links may be "hard" or "soft." A hard link creates two names for the same file, and a soft, or symbolic, link creates a second file which acts as a shortcut to the first.
The first form links sourcename to destname, where destname is usually either a new filename or (by default) a file in the current directory with the same name as sourcename. If destname is an existing file, it is overwritten; if destname is an existing directory, a link named sourcename is created in that directory. The second form creates links in destdirectory, each link having the same name as the file specified.
Back up any existing files. When using the long version of the command, the optional control parameter controls the kind of backup. When no control is specified, ln will attempt to read the control value from the VERSION_CONTROL environment variable. Accepted values are:
Never make backups.
Make numbered backups.
Match existing backups, numbered or simple.
Always make simple backups.
-d, -F, --directory
Allow hard links to directories. Available to privileged users.
Force the link (don't prompt for overwrite permission).
Print a help message and then exit.
Prompt for permission before removing files.
Replace symbolic links to directories instead of dereferencing them. --force is useful with this option.
Create a symbolic link. This lets you link across filesystems, and also see the name of the link when you run ls -l (otherwise, there's no way to know the name that a file is linked to).
Append suffix to files when making backups, instead of the default ~.