[原创]SCO UNIX下的反删除(undelete)

yeungxl

SCO OpenServer支持Versioning Filesystems(undelete),但是缺省却没有打开此项功能，下面是具体细节：
    1) scoadmin中选择Hardware/Kernel Manager，选择Filesystem configuration，
       设置MAXVDEPTH为一个非零值(n=保存多少以前版本，设置较大数时要考虑磁盘空间)
       设置MINVTIME(文件versioned之前等待的秒数)
    2) 重新编译(Relink)内核；
    3) 重新启动服务器；
    4) 启用Undelete，针对需要设置undelete的目录(例如:/u/data)
       undelete -s /u/data
    5) 为了察看Versioned情况,设置以下环境变量：
       SHOWVERSIONS=1&#59; export SHOWVERSIONS
    6) 用文件察看命令察看Versioned的文件，可以根据需要恢复删除或覆盖的文件。


undelete supports the following options:

If the -l, -p, -s, -u and -v options are not specified, undelete recovers the specified files.


-l
print a listing of all versions of the specified file(s)

-p
purge (permanently delete) specified source file(s)

-s
turn the version attribute on for the specified directories and its subsequent child directories

-u
turn the version attribute off for the specified directories

-v
force the specified file(s) to be versioned

The following additional options are recognized:

-d
normally, if the specified file is a directory, undelete will operate on the files contained in that directory. If this option is specified, undelete operates on the directory itself.


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NOTE: undelete does not work on directories that are mounted.
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-i
undelete will prompt for confirmation prior to recovering a file that will overwrite the current version of the file. A y answer means that the undeletion should proceed. Any other answer prevents undelete from undeleting the file.

-f
undelete will recover the file(s) without prompting even if it is overwriting over an existing current version of the file. This option overrides the -i option. Note that this is the default if the standard input is not a terminal.

-r
undelete will operate recursively on any directories in the argument list. Symbolic links that are encountered with this option will not be traversed.

-m [+-]days
undelete will only consider files that were deleted less than ( - ), greater than ( + ) or exactly (neither - nor + ) days ago.
   

flybirdxp

不错，建议大家都来看一下；
没有这么用过，不知道好不好用，大家评论一下。

rainbowzhou

这种功能说有用就有用，没用就没用，因为会备份的基本上不会需要，而且基本上不会出错，有用的人，就算有这个功能照样会丢失文件。

spirit

不错啊，我马上试一下

yeungxl

spirit,你试的结果如何呀？

rainbowzhou,估计你是在大单位工作，
所有的安全措施做的很足，很可能还有
在线备份。我是看了http://www.chinaunix.net/cgi-bin/bbs/topic.cgi?forum=4&topic=15408&show=90
贴子才有感而写的。

htldm

我马上试

hasjing

很好!

cgweb

我是新手,
我在kardware/kernel manager中找了半天也没找到filesystem configuration
为什么没有
请指教.

lcz88990200

kardware/kernel manager中找了半天也没找到filesystem configuration

我在sco ５.０５中也没找到  

sensir

我认为对于我们专业的技术人来说，UNIX下的反删除功能基本上是没意义的，关键还是要有谨慎的态度，譬如在删除之前我们完全应该而且也可以作出这样的确认：

“我该不该这样做？在这样做之前我还应该做些什么？”