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; 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。