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LINK(2) System Calls Manual LINK(2)

link - link to a file

link(name1, name2)
char *name1, *name2;

A link to name1 is created; the link has the name name2. Either name may be an arbitrary path name.

ln(1), unlink(2)

Zero is returned when a link is made; -1 is returned when name1 cannot be found; when name2 already exists; when the directory of name2 cannot be written; when an attempt is made to link to a directory by a user other than the super-user; when an attempt is made to link to a file on another file system; when a file has too many links.

(link = 9.)
sys link; name1; name2

UNIX-7