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SCO OpenServer支持Versioning Filesystems(undelete)，但是缺省卻沒有打開此項功能，下面是具體細節:

1) scoadmin中選擇Hardware/Kernel Manager，選擇Filesystem configuration，

設置MAXVDEPTH為一個非零值(n=保存多少以前版本，設置較大數時要考慮磁盤空間)

設置MINVTIME(文件versioned之前等待的秒數)

2) 重新編譯(Relink)內核;

3) 重新啟動服務器;

4) 啟用Undelete，針對需要設置undelete的目錄(例如:/u/data)

undelete -s /u/data

5) 為了察看Versioned情況，設置以下環境變量:

SHOWVERSIONS=1; export SHOWVERSIONS

6) 用文件察看命令察看Versioned的文件，可以根據需要恢復刪除或覆蓋的文件。

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.