/usr/sbin/unlink file
The link command is used to create a filename that points to another file. Linked files and directories can be removed by the unlink command; however, it is strongly recommended that the rm and rmdir commands be used instead of the unlink command.
The only difference between ln and link and unlink is that the latter do exactly what they are told to do, abandoning all error checking. This is because they directly invoke the link and unlink system calls.