文件和目录的链接数都由什么决定

cixzer

you can type "info link" in the shell.

1. $info link
   
2. A "hard link" is another name for an existing file; the link and the
   
3. original are indistinguishable.  Technically speaking, they share the
   
4. same inode, and the inode contains all the information about a
   
5. file--indeed, it is not incorrect to say that the inode _is_ the file.
   
6. On all existing implementations, you cannot make a hard link to a
   
7. directory, and hard links cannot cross file system boundaries.  (These
   
8. restrictions are not mandated by POSIX, however.)
   
9. 
   
10. "Symbolic links" ("symlinks" for short), on the other hand, are a
    
11. special file type (which not all kernels support: System V release 3
    
12. (and older) systems lack symlinks) in which the link file actually
    
13. refers to a different file, by name.  When most operations (opening,
    
14. reading, writing, and so on) are passed the symbolic link file, the
    
15. kernel automatically "dereferences" the link and operates on the target
    
16. of the link.  But some operations (e.g., removing) work on the link
    
17. file itself, rather than on its target.  *Note Symbolic Links:
    
18. (libc)Symbolic Links.
    

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海崎洋光

呵呵，老师今天也是这么说的！！！谢谢您的更正！！！

jefferic

看遍《UNIX教程》就不会对这种问题存有疑问了