To find hard links, first get the inode number of the file whose links you want to find. You can learn a file's inode number and the number of links to it by running `ls -i' or `find -ls'. If the file has more than one link, you can search for the other links by passing that inode number to `-inum'. Add the `-xdev' option if you are starting the search at a directory that has other filesystems mounted on it, such as `/usr' on many systems. Doing this saves needless searching, since hard links to a file must be on the same filesystem. See section Filesystems.
You can also search for files that have a certain number of links, with `-links'. Directories normally have at least two hard links; their `.' entry is the second one. If they have subdirectories, each of those also has a hard link called `..' to its parent directory.
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