有没有办法让软链接不可删除呢？

忍者5482

例如 tmp ->/data/tmp 这样一个软链接，怎么才能改为只读属性。
chmod -w 或者 chattr -i 都不行，都只是操作/data/tmp的属性了，没法对tmp这个软链接本身做操作。

有这样的需求是因为生产环境老是被删除软链接，crontab脚本太多，不知道哪个脚本干的。或者有办法在被删除的时候抓到是哪个进程删除的吗？

rdcwayx

cronjob 都是设在root里的吗？

jason680

chmod never changes the permissions of symbolic links; the chmod  sys-
       tem call cannot change their permissions.  This is not a problem since
       the permissions of symbolic links are never used.  However,  for  each
       symbolic  link  listed  on the command line, chmod changes the permis-
       sions of the pointed-to file.  In  contrast,  chmod  ignores  symbolic
       links encountered during recursive directory traversals.

STICKY FILES
       On  older  Unix  systems, the sticky bit caused executable files to be
       hoarded in swap space.  This feature is not useful on modern  VM  sys-
       tems,  and  the  Linux  kernel ignores the sticky bit on files.  Other
       kernels may use the sticky bit on files for  system-defined  purposes.
       On some systems, only the superuser can set the sticky bit on files.

STICKY DIRECTORIES
       When the sticky bit is set on a directory, files in that directory may
       be unlinked or renamed only by  root  or  their  owner.   Without  the
       sticky bit, anyone able to write to the directory can delete or rename
       files.  The sticky bit is commonly found on directories, such as /tmp,
       that are world-writable.

把连结档案放至有sticky的目录下（/ tmp目录本身就是stcky目录）下，
这样只有root及owner(所有者)才能删档.

$ whoami
test

$ ls -l /home/t
-rwxrwxr-x  1 root test 8 Nov 10 09:22 /home/t

$ ls -l /tmp/t
lrwxrwxrwx  1 root root 7 Nov 10 09:21 /tmp/t -> /home/t

$ rm /tmp/t
rm: cannot remove `/tmp/t': Operation not permitted
＃test不是/ tmp/t的owner，无法删档...

忍者5482

楼上的指了条明路啊，马上试试，谢了