有沒(méi)有辦法讓軟鏈接不可刪除呢？

忍者5482

例如 tmp ->/data/tmp 這樣一個(gè)軟鏈接，怎么才能改為只讀屬性。
chmod -w 或者 chattr -i 都不行，都只是操作/data/tmp的屬性了，沒(méi)法對(duì)tmp這個(gè)軟鏈接本身做操作。

有這樣的需求是因?yàn)樯�產(chǎn)環(huán)境老是被刪除軟鏈接，crontab腳本太多，不知道哪個(gè)腳本干的�；蛘哂修k法在被刪除的時(shí)候抓到是哪個(gè)進(jìn)程刪除的嗎？

rdcwayx

cronjob 都是設(shè)在root里的嗎？

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.

把連結(jié)檔案放至有sticky的目錄下（/ tmp目錄本身就是stcky目錄）下，
這樣只有root及owner(所有者)才能刪檔.

$ 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，無(wú)法刪檔...

忍者5482

樓上的指了條明路啊，馬上試試，謝了